Savannah 
Iran's Supreme Leader has expressed doubt that nuclear talks with the US will lead to a new agreement, saying it had made "excessive and outrageous" demands on uranium enrichment.
"We don't think it will lead to any outcome. We don't know what will happen," Ayatollah Ali Khamenei said.
US President Donald Trump said last week that Iran had "sort of" agreed to the terms of a deal following four rounds of talks mediated by Oman since 12 April.
But ahead of another round scheduled for this weekend, Iran's chief negotiator rejected his US counterpart's assertion that it would have to commit to stop producing enriched uranium, which can be used to make reactor fuel but also nuclear weapons.
Trump, who pulled the US out of a 2015 nuclear deal between Iran and world powers during his first term in office, has warned Iran that it could face US and Israeli military action if the talks are not successful.
Iran insists its nuclear activities are entirely peaceful and it will never seek to develop or acquire nuclear weapons.
However, it has breached restrictions imposed by the existing nuclear deal in retaliation for crippling US sanctions reinstated seven years ago, and has stockpiled enough highly-enriched uranium to make several bombs.
