Iran's Khamenei rejects US nuclear talks offer 7 February 2013 Last updated at 09:57 Iran's supreme leader has dismissed a US offer of one-to-one talks on Tehran's nuclear programme. Ayatollah Ali Khamenei said in a speech posted online that the US was proposing talks while "pointing a gun at Iran." On Saturday, US Vice-President Joe Biden suggested direct talks, separate to the wider international discussions due to take place later this month. But the US widened sanctions on Iran on Wednesday, aiming to tighten a squeeze on Tehran's ability to spend oil cash.