United Nations economic and military sanctions on Iran took effect again after Britain, France and Germany activated the snapback process linked to the 2015 nuclear agreement. The three governments, collectively known as the E3, said Iran's nuclear expansion and insufficient cooperation with international inspectors left them with no alternative.
The restored measures reverse sanctions relief granted a decade earlier under the Joint Comprehensive Plan of Action, or JCPOA. That agreement placed limits on Iran's nuclear facilities, enriched-uranium holdings and research in exchange for easing international restrictions. Its stated purpose was to permit a civilian nuclear program while preventing the development of a nuclear weapon.
The E3 cited Tehran's repeated breaches of the accord and said it had not adequately addressed their concerns despite extended negotiations. They specifically pointed to incomplete access for the International Atomic Energy Agency and the absence of an accounting for Iran's stockpile of highly enriched uranium. The agency said inspections had resumed by the Friday before the sanctions returned, after a suspension that followed strikes by Israel and the United States on Iranian nuclear and military sites in June.
Talks held alongside the UN General Assembly failed to secure an arrangement that would have delayed the restrictions. Even as they initiated snapback, the European governments said the move did not close the door to diplomacy and urged Iran to avoid further escalation.
Iran rejected the reinstated measures as illegal and unjustifiable and called on other countries not to enforce them. President Masoud Pezeshkian maintained that Tehran did not intend to build nuclear weapons. He also said progress on enrichment talks would require assurances that Israel would not attack Iranian nuclear sites. Iran had argued that the June strikes fundamentally altered the circumstances surrounding the nuclear agreement.
The accord had already been weakened after the United States withdrew in 2018 during Donald Trump's first presidential term. Iran subsequently expanded nuclear activities that the agreement had restricted. Western governments and the IAEA have continued to question whether Iran's program is entirely peaceful, while Tehran insists that it is.
Israel welcomed the return of sanctions and called for sustained international pressure to prevent Iran from acquiring a nuclear weapon. The restrictions restored international limits on trade and military activity, increasing pressure on Tehran while adding another obstacle to efforts to revive a negotiated framework. The immediate outcome was a renewed sanctions regime alongside unresolved diplomatic questions: whether inspectors would regain durable access, how Iran would account for enriched material, and whether further negotiations could limit an escalation that had already moved beyond the original deal's framework.
