The barrage comes ahead of a planned call between Presidents Trump and Putin on Monday, as the US pushes for a ceasefire.

Mercenaries are outlawed under international law. But Russia has misused the label to deny foreign fighters their protections as prisoners of war.

(Reuters) -British Prime Minister Keir Starmer on Sunday discussed the war in Ukraine with leaders of the U.S., Italy, France and Germany, a Downing Street spokesperson said. Looking ahead to U.S. President Donald Trump's call with Russia's President Vladimir Putin on Monday,

With future U.S. aid in doubt, Kyiv is ramping up domestic production of arms such as its Bohdana howitzer.