Japan Resumes Economic Sanctions Against Iran Amid Renewed UN Measures

On September 30, 2025, the Japanese government announced the reinstatement of economic sanctions against Iran, following the reactivation of United Nations sanctions due to Iran's nuclear development activities. This decision aligns with a U.N. Security Council resolution that mandates the freezing of assets belonging to 78 Iranian organizations and 43 individuals. Chief Cabinet Secretary Yoshimasa Hayashi emphasized the critical nature of the situation, stating, "This issue is now at a crossroads," and reiterated Japan's commitment to pursuing diplomatic solutions.

Japan TimesSanctions Against Iran Reinstated by Multiple NationsIran: Japan’s Reimposition of Sanctions “Legally Invalid”Japan urges continued diplomacy with Iran

The reimposition of sanctions was triggered by a snapback mechanism initiated by France, Germany, and the United Kingdom, citing Iran's non-compliance with the 2015 nuclear agreement. The U.N. sanctions, which had been lifted under the Joint Comprehensive Plan of Action (JCPOA), were reinstated on September 28, 2025. The sanctions include an arms embargo and restrictions on uranium enrichment activities, which Iran has denied pursuing for military purposes.

Iran: Japan’s Reimposition of Sanctions “Legally Invalid”Nikkei Asian ReviewJapan urges continued diplomacy with Iran

Iran has condemned the reinstatement of sanctions as illegal and has threatened to suspend cooperation with the International Atomic Energy Agency (IAEA). Iranian officials, including Foreign Ministry spokesperson Esmaeil Baghaei, have described the actions of the European powers as unjustifiable. The Iranian Embassy in Tokyo stated that Japan's decision to reintroduce sanctions lacks legal validity, arguing that U.N. Security Council Resolution 2231, which endorsed the JCPOA, stipulated that all nuclear-related sanctions would expire on October 18, 2025.

Iran: Japan’s Reimposition of Sanctions “Legally Invalid”Sanctions Against Iran Reinstated by Multiple NationsJapan urges continued diplomacy with Iran

Japan's Foreign Minister Takeshi Iwaya expressed regret over the return of sanctions, emphasizing the importance of dialogue in resolving the nuclear issue. He stated, "Japan's position — stressing the need to resolve the issue through dialogue — remains unchanged." Meanwhile, the European Union has reiterated that a sustainable solution to the Iranian nuclear issue can only be achieved through negotiation and diplomacy.

Japan urges continued diplomacy with Iran

Iranian officials have criticized the actions of the U.S., U.K., France, and Germany, asserting that these countries have misinterpreted their obligations under the JCPOA. The Iranian Embassy's statement highlighted that the European troika's actions were not in accordance with the procedures outlined in Resolution 2231, which requires consideration of the views of all states involved. Furthermore, Russia has disputed the legality of the reinstated sanctions, calling them unlawful.

Iran: Japan’s Reimposition of Sanctions “Legally Invalid”Japan urges continued diplomacy with IranNikkei Asian Review

While Japan and several Western nations have moved to reinstate sanctions, Iran maintains that these measures are invalid and that the sanctions should not be enforced. The Iranian government has called for international support against what it describes as unlawful actions by the European powers and the U.S. The ongoing diplomatic tensions suggest a complex landscape where both sides are entrenched in their positions regarding the nuclear agreement.

Sanctions Against Iran Reinstated by Multiple NationsJapan urges continued diplomacy with IranIran: Japan’s Reimposition of Sanctions “Legally Invalid”Nikkei Asian Review

• “The issue is now at a crossroads,” — Yoshimasa Hayashi, Chief Cabinet Secretary of Japan

Japan Times

• “We must not miss opportunities for dialogue.” — Yoshimasa Hayashi, Chief Cabinet Secretary of Japan

Sanctions Against Iran Reinstated by Multiple Nations

• “and European move, stressing: “The misuse of the JCPOA dispute resolution mechanism by the three European countries should not in any way affect the legal reality that Resolution 2231 must expire on October 18, 2025, as stipulated in the text.” — Esmaeil Baghaei, Iranian Foreign Ministry Spokesperson

Japan urges continued diplomacy with Iran

• “The misuse of the JCPOA dispute resolution mechanism by the three European countries should not in any way affect the legal reality that Resolution 2231 must expire on October 18, 2025, as stipulated in the text. Any attempt to revive terminated sanctions must therefore be considered null and void.” — Iranian Embassy in Tokyo

Japan urges continued diplomacy with Iran

The situation remains fluid, with diplomatic efforts continuing amidst rising tensions and conflicting interpretations of international law.

Iran: Japan’s Reimposition of Sanctions “Legally Invalid”