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.

On Monday, Trump said he would now give Putin 10 to 12 days, meaning he wants peace efforts to make progress by Aug. 7-9.