Japan and the Republic of Korea (ROK), as key American allies, should strengthen their conventional military capabilities, both offensive and defensive, to reinforce regional deterrence. Two critical steps are needed. First, Japan and South Korea must expand their capabilities to neutralize North Korea’s missile launchers. Second, Japan’s defense architecture should be aligned with South Korea’s Three-Axis System to create an integrated deterrence framework.

So far, to address concerns over potential nuclear decoupling, the US, Japan, and South Korea have explored multiple options. In addition to Washington’s repeated assurances that its nuclear extended deterrence remains intact, discussions have included modernizing American nuclear weapons, expanding nuclear-sharing agreements, redeploying tactical nuclear weapons to South Korea, and even the possibility of South Korea developing its own nuclear arsenal.

However, South Korea acquiring nuclear weapons remains highly improbable due to its significant political costs. From the 1960s to the 1980s, North Atlantic Treaty Organization (NATO) member-states feared the US might hesitate to retaliate with nuclear weapons if the Soviet Union launched a nuclear strike on Europe. While NATO pursued multiple strategies—most notably the dual-key system and the deployment of Pershing II missiles—these measures never fully resolved nuclear decoupling concerns.

Ultimately, NATO never confronted the full extent of this dilemma as the Soviet Union collapsed in 1991. Since the issue lies not in the US’s ability to retaliate but in its willingness to do so under specific conditions, the most practical approach is to adopt deterrence measures that North Korea perceives as credible.

First, Japan and South Korea should prioritize expanding their capabilities to neutralize North Korea’s nuclear missile launchers. A key advantage for the US, Japan, and South Korea—compared to NATO during the Cold War—is that North Korea is estimated to have around 50 nuclear warheads, far fewer than the tens of thousands in the Soviet arsenal.

In this context, Japan’s planned acquisition of enemy base strike capabilities should focus not only on expanding the number of available strike assets but also on improving their precision and destructive power to ensure maximum effectiveness against North Korean launch sites. At the same time, South Korea’s kill chain should further enhance its deep-strike capabilities by increasing assets like the Hyunmoo-4 missile, which is designed to penetrate deeply buried facilities.

Additionally, South Korea’s Drone Operations Command, established in 2023, should undergo a major expansion in drone assets capable of effectively detecting, tracking, and striking North Korean missile launchers. By integrating high-precision missiles and unmanned systems, both Japan and South Korea can significantly reduce North Korea’s ability to deliver nuclear strikes, thereby reinforcing deterrence.

Second, as Japan and South Korea expand their strike capabilities, Japan’s defense architecture should be aligned with South Korea’s Three-Axis System. This integration would allow both countries to allocate their finite military assets more effectively when targeting North Korea’s nuclear-related ground units. For example, given the geographic distance, Japan could focus on striking fixed targets such as command centers and underground missile storage sites while South Korea concentrates on eliminating mobile launchers that require rapid response and precision strikes.

Additionally, harmonizing Japan and South Korea’s missile defense structures would improve the likelihood of intercepting North Korean missiles. While Japan has developed its missile defense in close coordination with the United States, South Korea has opted to develop its own independent missile defense system, instead of fully integrating into the American-led ballistic missile defense framework.

However, aligning the two countries’ missile defense systems would significantly enhance regional interception capabilities. A fully integrated defense network would not only establish a more layered interception system against incoming North Korean missiles but also enable earlier response times—as Japan and South Korea deepen their real-time missile-tracking cooperation—South Korea’s response times could improve further. By improving both offensive and defensive coordination, Japan and South Korea can maximize deterrence and reduce North Korea’s nuclear strike effectiveness.

By implementing these measures, North Korea would be left with only a limited number of launchers capable of delivering nuclear weapons. While it is possible that some missiles could still be launched from the remaining launchers and a few might evade American missile defenses, North Korea would have to consider allocating few nuclear warheads against Japan, South Korea, and the United States. This would be necessary both to achieve its long-term political objectives and to deter US-ROK combined forces and US Forces Japan (USFJ) from retaliating in the short term.

Moreover, North Korean leadership would face significant uncertainty about whether its remaining nuclear missiles could successfully penetrate American missile defenses. In essence, by increasing their conventional strike capabilities and aligning their military strategies, Japan and South Korea could ensure that a substantial number of North Korean launchers are neutralized. This would force Pyongyang to operate with significantly reduced military options, making its attempt to create nuclear decoupling less credible.

However, this strategy is only viable as long as North Korea’s nuclear arsenal remains limited. If Pyongyang dramatically expands its warhead stockpile and launch platforms, conventional deterrence alone will no longer be sufficient, and the risk of nuclear decoupling will escalate beyond control. The US, Japan, and South Korea must act decisively—before the balance of power shifts irreversibly in North Korea’s favor. Time is running out.

Dr. Ju Hyung Kim, CEO of the Security Management Institute, a defense think tank affiliated with the South Korean National Assembly, is currently adapting his doctoral dissertation, “Japan’s Security Contribution to South Korea, 1950 to 2023,” into a book.

Strengthening Nuclear Deterrence in the Far East was originally published on Global Security Review.

It is good to have a combat veteran as the new Secretary of Defense. It is also good to have someone who, while writing a book on the current state of the military, came to understand the difficulties service members face, why they choose not to resign or not re-enlist, and how hard it can be for some once they leave the service. That same research will also help you to eliminate the politicization that left the military hurting for recruits.

This understanding and experience will be helpful in correcting the course of the Department of Defense. Prioritizing warfighting capabilities and lethality over supporting the mission creep of bureaucracy is critical but antithetical to everything that is Washington, DC. The Pentagon was focused on budgets and bureaucratic infighting long before you arrived. The five-sided puzzle palace will fight back and has a long institutional memory.

Just remember, of all services and the department itself, only the US Air Force Airmen gave more money to Republicans than Democrats. There is at least one ray of hope.

For decades the military has had its combat forces slashed, bases closed or consolidated, and weapon systems and platforms reduced or retired—all while the Chinese, Iranians, North Koreans, and Russians expanded their military capabilities and plotted the destruction of the international order Americans built. While the war on terror was lost by the very people who hate the fact that you are Secretary of Defense, you have an opportunity to right the ship before it is too late.

No doubt, you will receive more input on what you should do than you can possibly digest. Let me offer a quick list.

First, a sovereign state, by definition, controls its borders. That is a military function. Help President Trump secure the border. There is no such thing as acceptable illegal immigration.

Second, adopt the Weinberger Doctrine as your overriding strategy for the use of military force. You will never go wrong if you do.

Third, the military may be the best socialist system in the world, but it is time to overhaul the personnel system and bring it into the twenty-first century. The military is unique, but do not let that be an excuse.

Fourth, modernization and expansion of the nuclear arsenal must be your top spending priority. A bigger Army, conventional Navy, or conventional Air Force will not deter China, Iran, North Korea, or Russia; only a robust strategic and theater nuclear arsenal can achieve that objective.

Fifth, service members, particularly junior enlisted, have lived in toxic base housing for far too long. This problem should not make this list, but after two decades it has yet to be solved.

Sixth, remove the cancerous social and political activism that inundates the military. Nothing harms unity more than pitting servicemembers against one another because of their race, gender, or some other contrived distinction. Based on your initial actions, your efforts are already moving ahead.

Seventh, there is simply too much duplication across the services and within the services. Ensuring command opportunities should not lead to the creation of unneeded commands. The services are too small to be inefficient.

Eighth, expand the number of combatant ships, missile defense systems, and the combat air force. Neither the Navy nor the Air Force has the capability to wage a sustained campaign against a peer. Not only does the nation lack the delivery platforms, but it will go Winchester in a matter of days. Thus, every kind of weapon is also needed.

Ninth, take the time to reset the baseline and see what the military really needs to defeat the Axis of Autocracy. Is it drone swarms, missile technology, robots? Whatever the answer may be, it is unlikely exactly what we already have.

Finally, get very good at telling the American people why it is more important to spend tax dollars on the military than the entitlements they know and love. This is perhaps your biggest task. In 2024, the federal government took in $4.4 trillion and spent $4.6 trillion on entitlement programs alone. That is unsustainable. The federal government was never meant to take care of the health, retirement, and education of Americans. It was specifically tasked to defend the nation.

You have a big job ahead of you. Good luck. Americans want nothing more than your success. The safety of the country depends on it.

Michael Fincher is a Fellow at the National Institute for Deterrence Studies. Views expressed in this article are the author’s own.

Congratulations on Becoming the Secretary of Defense was originally published on Global Security Review.

India’s anti-satellite (ASAT) test, held on March 27, 2019, highlights its growing space capabilities and intent to weaponize space. India’s test, known as “Mission Shakti,” demonstrated its ability to intercept and destroy a satellite in low Earth orbit, positioning India as one of only four countries with such capabilities. While Indian officials maintain that the test was aimed at strengthening national security and not directed toward any particular country, such a capability would pose a significant threat to Pakistan’s space assets, which would undermine Pakistan’s situational awareness, communication, and command-and-control capabilities during a conflict.

The implications of India’s recent MIRV test to its intent in the space domain have received little scrutiny, with one Indian analyst suggesting that the country’s MIRV efforts complement its space ambitions. However, analysts did not address the potential implications on regional stability. India’s development and testing of advanced missile technologies suggest that New Delhi could use these capabilities for counter-space missions, including the targeting of satellites, and their expansion of counter-space weapons may disrupt the strategic equilibrium in South Asia.

Bringing MIRVs to Space

While the primary use of MIRV ballistic missiles is not in counter-space missions, there are scenarios and technologies related to MIRVs that could potentially be adapted for anti-satellite (ASAT) roles. Instead of carrying nuclear warheads, the MIRV could be equipped with kinetic kill vehicles (KKV) or other payloads designed to disable or destroy satellites through collision or other means. A missile equipped with MIRV technology could launch multiple payloads into space, each with its own propulsion and guidance systems, allowing them to maneuver into specific orbits close to target satellites. Moreover, the independent targeting capability of MIRVs means each payload could be directed to a different satellite, potentially allowing for simultaneous attacks on multiple targets in different orbits.

In addition, co-orbital systems can loiter in space and potentially engage targets when needed, providing a persistent threat compared to direct-ascent ASAT systems. MIRVs could be adapted for co-orbital ASAT missions by modifying their payloads and utilizing their independent targeting capabilities. Russia and China have demonstrated co-orbital ASAT systems, while the United States maintains advanced space technologies that could potentially be used in similar roles. The adaptation of MIRVs for such purposes would be complex and carry significant strategic and legal implications.

Implications for Regional Stability

Outer space is considered a global common, a concept established by the Outer Space Treaty of 1967, which ensures that space is free for exploration and use by all countries, cannot be claimed by any nation, must be used for peaceful purposes, and should be preserved for future generations. It is crucial that this principle should be consistently applied to preserve space for the benefit of all states for communication, navigation, weather monitoring, and scientific research. However, the growing overlap between military and space technologies is blurring the lines between these fields and raises apprehensions about the militarization and potential weaponization of the domain.

The advancements made by India in military technology and satellite capabilities, which integrate military and space capabilities, have raised significant concerns about the weaponization of space in Pakistani policy circles. Pakistan also tested a MIRV capability on its Ababeel missile. However, it never demonstrated its intent to develop counter-space weapons through policy or capability development. Pakistan’s space policy and activities are focused on peaceful uses of outer space, such as satellite communications, remote sensing, and scientific research. Islamabad has participated in international initiatives aimed at promoting the responsible and peaceful use of outer space, including discussions on space security and arms control within forums such as the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS).

Considering India’s development and modernization of its military beyond traditional security needs, such as its ASAT capability and advanced missile ranges, there is a possibility that New Delhi may use MIRVs for counter-space missions in the future. In a scenario of escalating tensions with Pakistan, India could conduct counter-space missions by either placing co-orbital ASAT systems during a brewing crisis or launch KKVs during a conflict by using MIRV capability. This would enable India to destroy Pakistani satellites, severely impairing Pakistan’s situational awareness, disrupting secure military communications, and degrading command-and-control functions.

As New Delhi strengthens its counter-space capabilities, its potential development of counter-space capabilities can upset the balance maintained by Pakistan’s effective deterrence posture in South Asia. The complex interplay between nuclear and conventional forces maintains this balance. However, there is a growing asymmetry between India and Pakistan in space capabilities.

New Delhi’s substantial advancements and investments in space technology and infrastructure outmatch Pakistan’s space capabilities, creating a significant power disparity where India has a much greater capacity to deploy and utilize space-based assets for various purposes, including military and intelligence gathering. India’s disproportionate expansion of space capabilities not only poses a threat to Pakistan but also China. Their reliance on satellites for command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) functions is growing to address genuine security needs. Pakistan recognizes the strategic importance of information superiority in modern warfare.

With evolving security challenges, including border surveillance and counter-terrorism operations, Islamabad is enhancing its C4ISR capabilities through significant technological upgrades such as satellite programs and advanced communication systems, along with the integration of centralized command centers and secure communication networks. The expansion includes increased use of drones for surveillance and reconnaissance, development of electronic warfare capabilities, and robust cybersecurity measures.

Human resources are being developed through specialized training and international collaboration, particularly with China and Turkey, to facilitate technology transfer and interoperability. These efforts aim to improve situational awareness, decisionmaking, and operational effectiveness, strengthening Pakistan’s overall national security.

During a crisis, Pakistan may face the risk of its satellite assets being targeted which could have significant impact on its military and strategic capabilities. Pakistan could face severe constraints in its C4ISR capability. Moreover, the integration of satellite communication into Pakistan’s drone operations and C4ISR framework highlights the dependence on these assets for maintaining robust communication. Hence, the loss of satellite communication could disrupt command-and-control functions, impairing coordination and timely decisionmaking across the armed forces.

In view of these reasons, it is possible to conclude that India’s MIRV test represents a dangerous shift in the domain of space weaponization. The integration of MIRV technology with India’s missile systems not only enhances its nuclear deterrence but also signals its potential use for counter-space capability. Therefore, while India’s achievements in missile technology and space capabilities are notable, they carry significant risks for regional stability.

Maryyum Masood is working as a Research Officer & Associate Editor at the Center for International Strategic Studies (CISS) Islamabad. She is an MPhil scholar in the Department of Strategic Studies at the National Defense University (NDU) Islamabad. Views expressed in this article are the authors own.

India’s MIRV Development – A Latent Counter-space Capability was originally published on Global Security Review.