Iran on Sunday condemned as "unjustifiable" the reinstatement of United Nations sanctions over its nuclear programme, after the collapse of talks with Western powers and Israeli and US strikes on its nuclear sites.

Iran sanctions relief extension under nuclear deal fails at U.N. with 4-9 vote, as European nations and U.S. oppose China-Russia backed resolution.

Addressing the world's leaders, Iranian President Masoud Pezeshkian on Wednesday blamed the United States and Israeli attacks for "dealing a grievous blow" to peace negotiations as Tehran braces for the reinstatement of sanctions next week,

His comments at the General Assembly are the first time he has spoken in a global forum since the 12-day Israel-Iran war over the summer.

Masoud Pezeshkian accused the UK, France and Germany of acting ‘at the behest of the United States of America’.

Tehran and Washington signalled a possible softening in nuclear tensions on Wednesday, with Iran insisting it has no ambitions to build nuclear weapons and the U.S. expressing readiness to resume talks aimed at resolving the long-standing standoff.

Iran has executed at least 1,000 people so far in 2025, an NGO said on Tuesday, denouncing a "mass killing campaign" in prisons in the Islamic republic.