This marked the collapse of a decade-long diplomatic agreement that once promised to restrain Iran’s nuclear program in exchange for sanctions relief. The re-imposition of UN sanctions on Iran through the JCPOA snapback mechanism underscores not only Iran’s isolation, but also the failure of Western diplomacy. By abandoning reciprocity, relying on coercion, and aligning with Washington’s “maximum pressure” strategy, European powers not only eroded trust but also exposed their inability to sustain credible agreements, making sanctions a symbol of diplomatic defeat rather than success.

The roots of Iran’s sanctions regime date back to 2005 when the International Atomic Energy Agency (IAEA) declared Iran non-compliant with its safeguard obligations. In 2006, the UN Security Council unanimously approved sanctions restricting uranium enrichment materials, missile technology, and related financial transactions. Successive resolutions in 2007 and 2008 further tightened the restrictions. In 2010, sanctions were expanded to target Iran’s oil revenues and banking sector, linking them directly to proliferation concerns.

These sanctions were lifted under the JCPOA in 2015, an agreement between Iran and world powers. The agreement also included a snapback clause; if Iran violated its obligations, any party to the agreement can activate the snapback mechanism and re-impose sanctions before the expiration date of the JCPOA on October 18, 2025. On August 28, 2025, after repeatedly accusing Iran of non-compliance, the E3 (France, Germany, and the UK) activated the snapback mechanism that will re-impose UNSC sanctions on Iran after a 30-day time period.

The snapback that went into effect on September 28, 2025, reinstates UNSC sanctions, originally imposed 2006–2010. These sanctions include an arms embargo, ban on ballistic missile technology transfers, and restrictions on oil revenues and financial services—including Iran’s central bank. This decision aligns Europe more closely with the American position, despite Washington having withdrawn from the JCPOA in 2018. However, the sanctions are not binding on China and Russia, and both remain aligned with Iran and critical of the European move.

Iranian President Masoud Pezeshkian condemned the sanctions as “unfair, unjust, and illegal.” Tehran recalled its ambassadors from the United Kingdom, France, and Germany for consultations but clarified it had no immediate plans to withdraw from the Nuclear Non-Proliferation Treaty (NPT). Any further response, however, will likely be determined by the Iranian parliament.

The JCPOA was built on reciprocity and trust, but after the US withdrew, Europe failed to deliver promised economic benefits. Instead, Iran faced escalating accusations and even sabotage.

Coordinated attacks by the US and Israel in June 2025 on Iran’s nuclear facilities during negotiations eroded any remaining trust in Western intentions. Today, Iranian officials view Western diplomacy less as a pathway to compromise and more as a tool for coercion and deception.

While Russia and China echoed Iran’s position and warned that the European move would fuel further instability in the region, the E3 maintained that Iran’s nuclear activity crossed red lines. E3 members also emphasized that diplomacy was not over by offering to delay sanctions for six months if Iran restored access for inspectors and engaged in talks with the US.

The reactivation of sanctions primarily reflects Europe’s failure to secure diplomatic gains after the 12-day war earlier this year. Western powers assumed Iran’s weakened position, given that internal unrest, economic strain, and military pressure would push it toward compromise. Instead, Iran resisted demands for zero enrichment and even presented partial solutions at the UN, which were rejected. The E3’s alignment with Washington now resembles Trump’s “maximum pressure” strategy, raising the risk of further escalation rather than resolution.

Nevertheless, the first brunt of these sanctions will fall on ordinary Iranians. Currency devaluation, unemployment, and economic stagnation will intensify along with the hardships caused by protests and war. The Iranian banking sector, already fragile, faces further isolation. Yet for Iran’s leadership, these sanctions may not dramatically alter strategic calculations. Having endured American sanctions since 2018, Tehran has adapted by relying increasingly on its Look East strategy to deepen economic and diplomatic ties with China and Russia.

The energy sector will again come under strain, but much depends on how aggressively the US enforces secondary sanctions, particularly against China, one of Iran’s largest oil buyers. If oil exports continue through alternative routes, Iran will remain financially afloat, albeit constrained. Thus, the sanctions are more likely to weaken Iran internally while leaving its external policies largely intact.

Perhaps the most dangerous consequence of the snapback is the possibility of renewed Israeli strikes against Iran’s nuclear infrastructure. In June 2025, Israel used IAEA findings as justification for bombing Iranian facilities, sparking a costly 12-day conflict. Israel could again resume attack under the guise of re-imposition of UNSC sanctions.

The attacks stalled Iran’s nuclear program by roughly two years, thus dragging the US into a wider regional confrontation with little strategic gain. By contrast, the JCPOA achieved restrictions on Iran’s nuclear program without military confrontation and provided economic benefits and political openings for both sides. It shows that diplomacy slows proliferation more effectively and cheaply than war. Yet with sanctions restored, Israel may once again seek a military solution, raising the risk of escalation across the region.

The re-imposition of UN sanctions through the snapback mechanism signals both the collapse of trust in the JCPOA framework and the deepening rift between Iran and the West. For Iran, the sanctions reinforce the perception that Western promises are unreliable, and diplomacy is a trap.

For Europe, the move highlights its limited influence, as it increasingly gravitates toward Washington’s approach rather than pursuing independent solutions. Ultimately, sanctions will punish ordinary Iranians more than they will alter Tehran’s strategic direction. With China and Russia unlikely to comply, Iran’s external lifelines remain intact. What has been lost, however, is the fragile trust built over a decade of negotiations.

The JCPOA demonstrated that diplomacy could restrain Iran’s nuclear ambitions without war; the snapback demonstrates how easily that progress is undone. As tensions rise, the international community faces a choice, either double down on coercion or return to diplomacy. The lesson of the past decade is unmistakable: military and economic pressure may delay Iran’s nuclear program, but only diplomacy can stop it.

Sidra Shaukat is a Research Officer at SVI. Views expressed in this article are the author’s own.

Snapback Sanctions: The Collapse of Western Diplomacy with Iran was originally published on Global Security Review.

The relatively well-organized Hayat Tahrir al Sham rebel force liquidated the resistance power of government forces within just a few days. The regime change, and the resultant uncertainty in Syria, invite regional powers to intervene for political and strategic spoils. Israel also conducted numerous air strikes to dismantle Syrian military and strategic capabilities.

The Asad regime posed a significant challenge for the US, which led the US to support rebel factions. The loss of the regime is a major setback to Iran’s axis of resistance and also puts Russian strategic interests in jeopardy. In the aftermath of the current development either the model of Libya or Iraq can be the possible trajectories for Syria.

Middle Eastern Ba’athist regimes emerged, in the second half of the century, as Arab nationalist leaders, championed the ideologies of Pan-Arabism, socialism, secularism, anti-imperialism, and anti-Zionism. Despite their lofty ideals, these regimes, exemplified by Assad’s rule in Syria, devolved into deeply authoritarian systems characterized by the centralization of power, political repression, and a departure from their original revolutionary aspirations.

Political oppression by the Assad regime created numerous ethnic and sectarian fault lines that were later exploited by the regional and extra-regional powers. The alleged Iranian support and Russin aerial cover seem to have kept the Assad regime in power even after the so called Arab Spring removed numerous autocratic regimes across the Middle East and North Africa (MENA) region.

Syria exemplifies the emerging threat of rebel movements to dysfunctional polities and how they gain national legitimacy. Hayat Tahrir al-Sham (HTS) is a Salafi-Jihadist organization and a splinter group of al-Qaeda. The avowed pronouncements of HTS allude to independence from al-Qaeda’s influence, thus forsaking any territorial claim in the name of the caliphate beyond Syria.

Assad’s Syria had also long been an irritant for US and Israeli interests by being a crucial component of Iranian perfidy in the region. HTS, however, is a United Nations designated terrorist organization and is also considered one by the European Union and the US. Irrespective of this fact, America and its partners expressed jubilance over the HTS takeover, which creates room for speculation that the US and others covertly supported HTS regime change in Syria.

Millions of Syrian refugees and the ongoing Kurdish desire for independence prompted Turkish involvement in the Syrian quagmire. Ankara makes little secret of its desire to neutralize the ambitions of Kurdish leaders demanding autonomy in the North of Syria. President Donald Trump described Turkey as the most important player on the Syrian chessboard after the fall of Damascus.

Having much at stake in the future of Syria, Turkish involvement and material support cannot be ruled out in the overthrow of the Syrian government under Assad. Kurds control 25 percent of Syrian territory, including much of the oil-rich area, while being less than 10 percent of the total population. Kurdish administration of North and East Syria is also a strong bulwark against the ISIS threat, and it was supported by the US in the past. HTS’s pronouncements regarding the formation of a secular and inclusive government will be tested in the crucible of time considering Kurd-Turkish animosity.

Relations between the Islamic Republic of Iran and the Assad regime stood the test of numerous crises in the Middle East. The so called Shia Cresent, along with the Houthis, provided a sense of strategic depth to Iran vis-à-vis military threats in the Middle East. With the axis of resistance being torn apart, Iran finds itself deprived of deterrence capabilities, in the backdrop of the fall of Damascus. Hence it must explore other strategic options to achieve its aims and objectives.

Russia has long used its strategic partnership with Damascus to project power across the MENA region through military and naval assets. Russian airstrikes were crucial instruments of subversion of the political dissent and armed struggle against the Syrian despot. The fall of Assad does not mean the strategic retreat for Russia. As Mohammad Al Jolani, the leader of HTS, stated, “We don’t want Russia to leave.”

This statement underscores the strategic importance of Russia in Syrian geopolitical calculus. It seems that Russia will stay in the region despite many analysts predicting a possible diminishing Russian presence in Syria.

China has emerged as a credible mediator on the Middle Eastern political horizon after the Saudi-Iran deal. China could potentially help resolve the differences among the warring factions within Syria. It could potentially transform the zero-sum strategic contestation in Syria. The importance of Syrian conflict for China could be discerned by its use of the veto eight times,  on related issues, during the past decade at the United Nations Security Council.

Syrians made history with their success in toppling the Assad regime, but their greatest challenge lies ahead, building a positive future. Syria is exactly at the point of its national history where Iraq and Libya were after the fall of Saddam Hussein and Muammar Gaddafi, respectively.

Both nations followed a contrasting trajectory with Libya continuing its struggle to end its violent conflict and build state institutions while Iraq had a series of elections since 2005, which helped to develop mechanisms for political bargaining, particularly between Shi’a, Sunni, and Kurdish factions. Syria faces similar challenges including the sectarian fault lines and Kurd minority.

The consociationalism model for governance practiced in Iraq may best fit the social and political imperatives in Syria. Although foreign aid and rescinding the sanctions could help build the Syrian state and society, internal reconciliation and power-sharing mechanisms could only satiate the concerns of stakeholders for lasting peace. The idiosyncratic socio-political climate of Syria requires the restraint and political acumen on the part of the victorious group to avoid another civil war.

HTS’s leadership has announced that it may take at least four years before Syria will have a general election. Confidence in the state’s institutions must be restored and strengthened to create a viable state. Lifting sanctions and technical and humanitarian assistance can help build the Syrian state and society. But it will ultimately require the peaceful resolution of difference for any form of liberal government to succeed in Syria.

Muhammad Haseeb Riaz is a Research Assistant at Center for International Strategic Studies (CISS), Islamabad.

The Geo-Political Implications of New Syria and Future Pathways was originally published on Global Security Review.