Biden Says Believes Iran Serious About Talks but Unclear How Serious

US President Joe Biden said on Friday he believed Iran is serious about negotiations over its nuclear program, but it was unclear how serious.

Asked at the White House if he thought Tehran was serious about talks that have been taking place in Vienna, Biden replied: "Yes, but how serious, and what they are prepared to do is a different story. But we're still talking."

Washington has expressed its readiness to lift many of its sanctions on Iran at the Vienna nuclear talks but Tehran is demanding more, top Iranian negotiator Abbas Araqchi told state media on Friday.

"The information transferred to us from the US side is that they are also serious on returning to the nuclear deal and they have so far declared their readiness to lift a great part of their sanctions," Araqchi told state TV.

"But this is not adequate from our point of view and therefore the discussions will continue until we get to all our demands," Araqchi said as indirect talks resumed on Friday in the Austrian capital.