With Monday’s deadline looming to reach a deal on Iran’s nuclear programme, an extension to the talks is looking likely.<br /><br />US negotiators in Vienna remain optimistic about the possibility of an agreement despite big gaps which they are said to be chipping away at.<br /><br />The six world powers say Iran still refuses to curb uranium enrichment in return for having sanctions lifted. Tehran rejects Western suspicions it is developing a nuclear weapon.<br /><br />Iran is facing domestic pressure not to make concessions.<br /><br />The supreme leader Ayatollah Ali Khamenei has the final say on a deal, and has repeatedly warned that he is pessimistic over the chances of reaching one.<br /><br />The Russian Foreign Minister is expected to join talks this evening as the talks head into their final hours.
