Iran's top security official, Ali Shamkhani, says the US lacks a will to revive a 2015 nuclear deal.

Iran says US indecision complicates talks

The United States does not have the will to reach an agreement to revive a 2015 nuclear deal with Iran at talks in Vienna where it is insisting on “unacceptable proposals”, Iran’s top security official, Ali Shamkhani, says.

The 2015 deal that lifted sanctions on Iran in return for curbs on its nuclear program was on the verge of being restored after 11 months of negotiations.

That was until Russia presented a new obstacle by demanding written guarantees from the United States that Western sanctions over its invasion of Ukraine would not affect its trade with Iran.

Shamkhani said on Twitter that in the absence of a political decision by the United States the talks “become more complicated every hour”.

The United States “has no will to reach a strong agreement”, he said adding that it was making “unacceptable proposals (and) insists on a quick agreement with false pretences”.

He did not elaborate on the US proposals.

Negotiators in Vienna are still trying to tackle a few key issues, said the semi-official Tasnim news agency citing an unnamed source.

US Under Secretary of State for Political Affairs Victoria Nuland on Tuesday accused Russia of seeking to reap extra benefits from its participation in the effort to restore the nuclear agreement.

A revived nuclear deal cannot limit Tehran’s pursuit of its missile and space programs, said Nour news, which is affiliated with a top security body.

Read the article in The Young Witness (AAP).