The Russian president says Moscow's initial tough demands must be met, despite a looming US sanctions deadline.

Russian President Vladimir Putin said that Moscow hoped for more peace talks with Ukraine but that the momentum of the war was in its favour, signalling no shift in his stance despite a looming sanctions deadline from Washington.

"I'm going to reduce that 50 days that I gave him to a lesser number," Trump said as he met British Prime Minister Keir Starmer.