Amid U.S. involvement in a war against Iran, President Donald J. Trump has decided to double down on previous public expressions of disregard and distrust toward NATO. President Trump has threatened to withdraw the United States from NATO several times since his reelection. His repeated jibes at the alliance have raised concern among European defense experts and government officials. Former U.S. Ambassador to NATO Ivo Daalder recently noted that “It’s hard to see how any European country will now be able and willing to trust the United States to come to its defense.” And French President Macron indicated on April 2nd that, in his view, U.S. President Trump was undermining NATO through his repeated threats to withdraw from the alliance. Raising new fears of American abandonment on the part of European leaders, Trump, in various interviews and social media posts within a few days, said that the United States “will remember” France’s refusal to assist in the war against Iran; that NATO was a “paper tiger”; and that “Putin knows that, too, by the way.”

The most recent Presidential broadsides against NATO reflected Trump’s frustration with European allies who chose not to involve themselves in the war against Iran and/or denied their political and military support for the actions taken under Operation EPIC FURY—an effort that Secretary of War, Hegseth describes as “laser-focused [to] destroy Iranian offensive missiles, destroy Iranian missile production, destroy their navy and other security infrastructure – and they will never have nuclear weapons.” But this hesitancy among European allies should not have surprised U.S. leadership. Neither NATO as an alliance nor individual European governments were consulted before the decision to go to war, nor were they fully informed until the operation was already in progress. Further to the issue of NATO support, Trump’s address to the nation on April 1st simply assumed that the United States would wind up its military operations within several weeks and would turn the problem of unblocking shipping in the Strait of Hormuz over to European countries and others. In addition, Western European governments have strong public support for putting distance between themselves and the war in Iran. Popular majorities in every country oppose the U.S. and Israeli campaign, and European opposition to the war is enhanced by Trump’s personal unpopularity on that side of the Atlantic.

An additional element in the split between Trump and NATO was the Russian interpretation of its implications for the war in Ukraine, and more broadly, for Russia’s national security strategy writ large. Prolonged U.S. commitment to war in the Middle East could deplete the availability of military assets that would otherwise be available to sustain Ukrainian forces in their fight against Russia. The global spike in gas and oil prices was an obvious boon to the Russian economy and, from the standpoint of Ukrainian President Volodymyr Zelensky, an unwelcome distraction for European leaders from the priority of supporting Ukraine. Russia also took advantage of Epic Fury to reinforce its support for Iran by providing targeting information for Iranian missile attacks against Israel and other regional states. Russia and Iran had already been sharing technology and knowledge with respect to drone warfare even prior to the launch of military operations against Tehran.

To some extent, the volatility in the Trump administration’s approach to NATO reflected the President’s frustration at his inability to broker a peace agreement between Ukraine and Russia. Vladimir Putin viewed Russia’s war as existential and refused to acknowledge that there was any distinction between Ukrainian and Russian civilizations, let alone sovereignties. The Ukrainians responded in kind, resisting Russia’s invasion and occupation of Ukrainian territory with creative use of drone technology and edgy defensive strategizing that put at risk a variety of targets in Russian territory, including bomber bases and critical infrastructure. Worse for Putin, his invasion in 2022, preceded by Russia’s annexation of Crimea in 2014, refocused NATO on its primary mission of deterrence and defense in Europe as opposed to “out of the area” operations such as Iraq and Afghanistan. Even the formerly Cold War neutral states, Sweden and Finland, were added to NATO’s membership because of Russia’s attempted coup de main against Kiev that turned into the longest and most destructive war in Europe since World War II. Caught in a trap of his own making, Putin continued to pour troops and material into the battlefields of Donbas and elsewhere in eastern Ukraine to support a more favorable negotiating position, should productive negotiations ever materialize.

Given Trump’s propensity for rearranging the deck chairs on foreign policy via Truth Social memoranda, it is conceivable that he will tone down the anti–NATO rhetoric once he has decided on a strategy for winding down the U.S. military campaign in Iran. The process of deconflicting the Strait of Hormuz will likely involve participation from European nations and other countries. Almost nobody benefits from continued bottlenecks in global shipping of oil and other vital commodities. Regardless of the outcome in Iran, the United States needs NATO, and NATO needs the United States. Without the U.S. as the indispensable leading partner, NATO Europe has insufficient nuclear or conventional deterrence against further Russian aggression. This assertion implies no disregard for the steps that the U.S. European allies have already taken since 2022 to improve the quality of their armed forces and military–industrial complexes. It is instead a recognition that the unique American nuclear deterrent and conventional war-fighting capabilities, supported by European determination to resist further Russian aggression, create a global as well as a regional deterrent for Russia and its partners (The CRINKs – China, Russia, Iran, and North Korea) that benefits not only NATO but also world peace. On the other hand, a divided and internally fractious NATO invites further aggression within and beyond Europe.

Stephen J. Cimbala is Distinguished Professor of Political Science at Penn State Brandywine and the author of numerous works on nuclear deterrence, arms control, and military strategy. He is a senior fellow at NIDS and a recent contributor to the Routledge Handbook of Soviet and Russian Military Studies edited by Dr. Alexander Hill (Routledge: 2025). The views of the author are his own.

Trumping NATO was originally published on Global Security Review.

The challenge with all such posts is that they never tell the whole story. Yes, Russia and China are refusing to enter arms control negotiations with the United States and Russia is believed to be conducting hydronuclear tests that produce a nuclear yield, but the President’s post does not mean what you may think.

Contrary to the wailing and gnashing of teeth of arms control advocates after Trump’s post, he is not calling for a return to detonating nuclear warheads under the Nevada desert. He is calling for something much different, which is why his post included, “…on an equal basis.” This point is important and was seemingly lost on many.

What many Americans may not know is that the United States last tested a nuclear weapon in 1992 and has, since at least 1996, interpreted the Comprehensive Test Ban Treaty (CTBT) to mean that nuclear testing cannot produce a nuclear yield. Thus, the United States, has voluntarily followed the CTBT and produced “zero yield” in the many tests it has conducted over the past three decades. American scientists were able to verify the continued safety, security, and effectiveness of the nation’s nuclear arsenal without producing an explosive yield.

President Trump is simply enabling American scientists to conduct hydronuclear tests that can provide higher fidelity results as the nation modernizes its existing nuclear warheads and begins building the first new nuclear warhead in more than a generation. This is a very important distinction.

The President, who often speaks in generalities, can be faulted for not offering a level of detail that explained his post more clearly, but articles claiming he does not understand nuclear testing may be less accurate than the President’s critics believe. The relationship between the Department of War and the Department of Energy, when it comes to nuclear weapons, is symbiotic. The Department of Energy designs and builds the weapons at its federally funded and privately operated labs, under the management of the National Nuclear Security Agency, but the Department of War drives the demand for capabilities. Thus, criticizing the President for saying the Department of War will do the testing is a bit of a hollow victory.

With Russia unwilling to extend New START and China’s continuing unwillingness to join multilateral arms control negotiations, President Trump’s statement was an attempt at demonstrating American resolve in the face of America’s declining nuclear position. The reality is that Russia understands its strength is in its nuclear forces, not its conventional capabilities.

If President Trump deserves criticism for anything, it is incorrectly suggesting that the American nuclear arsenal is superior to that of Russia; it is not. Russia’s arsenal is both newer and larger than that of the United States.

Russia may also breakout of New START limits upon the treaty’s expiration, which is a worrying prospect for the United States. Russia’s abrogation the Comprehensive Test Ban Treaty (CTBT) in 2023, in retaliation for Western support of Ukraine, is also concerning. It is, however, unsurprising. Before, Russia at least tried to ensure any violations of the “zero yield” understanding was hidden from the global public. That may cease if the Ukraine war continues. Although, President Trump’s announcement may have contained Russian ambitions.

Russia may have announced “reciprocal measures” if the United States begins testing, but Vladimir Putin knows the US is looking to conduct tests at the same level as Russia’s existing tests. China called on the US to uphold the moratorium on nuclear testing, but China may have also violated the “zero yield” threshold in its effort to build advanced nuclear weapons. Unfortunately, neither the Chinese nor Russian programs is particularly visible to Western monitoring efforts.

The prospects for Russo-American cooperation are low, but this should come as no surprise considering nuclear weapons are Russia’s trump card, no pun intended, when it comes to limiting Western support to Ukraine. Putin cannot afford to lose in Ukraine. His head, quite literally, is on the line.

Chinese nuclear forces are still inferior to American nuclear forces, but not for long. Thus, joining multilateral negotiations are not in China’s core interests as the Chinese Communist Party builds a nuclear arsenal fit for deterring American intervention with Chinese plans to seize Taiwan and perhaps other disputed territories. Of course China responded to President Trump’s post by calling it “unreasonable and unrealistic.” Hypocrisy on nuclear issues will not, however, stop Chinese communists from expanding their arsenal.

President Trump’s post is understandable given the world in which he finds himself. The President must try to deter continued Chinese and Russian aggression. If resuming nuclear testing helps, it is well worth the effort. What the President’s words will not do is start an arms race. That would require the United States to be a participant, and the Chinese and Russians left the starting blocks long ago.

Adam Lowther is the Co-founder and VP for Research at the National Institute for Deterrence Studies.  Views expressed in this article are the author’s own.

Understanding President Trump’s Truth Social Post on Nuclear Testing? was originally published on Global Security Review.