AFP, Tehran

Iran yesterday 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.

The measures, which bar dealings linked to the Islamic republic’s nuclear and ballistic missile activities, took effect overnight after Western powers triggered the so-called “snapback” mechanism under the 2015 nuclear accord.

“The reactivation of annulled resolutions is legally baseless and unjustifiable... all countries must refrain from recognising this illegal situation,” the Iranian foreign ministry said in a statement.

“The Islamic Republic of Iran will firmly defend its national rights and interests, and any action aimed at undermining the rights and interests of its people will face a firm and appropriate response,” it added.

The return of the sanctions ends months of tense diplomacy aimed at reviving nuclear talks derailed since June, when Israeli and US forces bombed Iranian nuclear facilities.

Despite the reimposition, Western leaders stressed channels for dialogue remained open.

Kaja Kallas, the European Union’s top diplomat, on Sunday said the reimposition of sanctions “must not be the end of diplomacy”, adding that “a sustainable solution to the Iranian nuclear issue can only be achieved through negotiations”.

US Secretary of State Marco Rubio urged Iran to “accept direct talks, held in good faith”.

He also called on UN member states to “immediately” implement sanctions to “pressure Iran’s leaders to do what is right for their nation, and best for the safety of the world”.

The British, French and German foreign ministers said in a joint statement they would continue to seek “a new diplomatic solution to ensure Iran never gets a nuclear weapon”.

They also called on Tehran “to refrain from any escalatory action”.

Iran had allowed UN inspectors to return to its nuclear sites, but President Masoud Pezeshkian said the United States had offered only a short reprieve in return for handing over its whole stockpile of enriched uranium, a proposal he described as unacceptable.

An 11th-hour effort by Iran allies Russia and China to postpone the sanctions until April failed to win enough votes in the Security Council on Friday, leading to the measures taking effect at 3:30am in Tehran (0000 GMT) on Sunday.

Russia made clear it would not enforce the sanctions, considering them invalid.

The sanctions “finally exposed the West’s policy of sabotaging the pursuit of constructive solutions in the UN Security Council, as well as its desire to extract unilateral concessions from Tehran through blackmail and pressure,” Russian Foreign Minister Sergei Lavrov said.

Iran has long contended that it is not seeking nuclear weapons.

Newspapers in the Islamic republic gave contrasting reactions to the reimposition of the sanctions.

The ultraconservative newspaper Kayhan, which opposes any dialogue with the United States, suggested the sanctions would likely have been imposed even if Iran had engaged in negotiations.

The reformist daily Ham Mihan wrote: “The big question is whether Russia and China will maintain their position”.