Iran is ready to engage with the US at talks on Saturday over its nuclear programme "with a view to seal a deal", its Foreign Minister Abbas Araghchi has said, BBC reported.

But US President Donald Trump must first agree there can be no "military option", Araghchi said, and added that Iran would "never accept coercion".

He also insisted the negotiations in Oman would be indirect, contradicting Trump's surprise announcement on Monday that they would be "direct talks".

Trump, who pulled the US out of a 2015 nuclear deal between Iran and world powers during his first term, warned that Iran would be in "great danger" if talks were not successful, according to BBC.