UK Prime Minister Keir Starmer has accused Russian President Vladimir Putin of not taking US-led ceasefire efforts seriously. His remarks come ahead of a key summit where leaders will discuss support for Ukraine.

Russian President Vladimir Putin said Thursday that he agrees in principle with a U.S. proposal for a 30-day ceasefire in Ukraine, but he emphasized that the terms are yet to be worked out and noted that any truce should pave the way to lasting peace.

Vladimir Putin says fighting must end in Ukraine, but adds a ceasefire should lead to "enduring peace and remove underlying causes of this crisis" He says the idea of a ceasefire is "good and we absolutely support it but there are issues that we need to discuss" The US and Ukraine have said the ball is now "in Russia's court",