Republican Senator Chuck Grassley of Iowa said in a post on X Friday: "IVE SEEN ENOUGH KILLING OF INNOCENT UKRAINIAN women + children. President Trump pls put the toughest of sanctions on Putin. U ought to c from clear evidence that he is playing America as a patsy."

US President Donald Trump and Ukrainian President Volodymyr Zelensky held crunch war talks in the heart of the Vatican minutes before the start of the funeral of Pope Francis on Saturday, as the White House mounts an increasingly urgent push to strike a peace deal in Ukraine.

The US president says he fears the Russian leader is "tapping me along" given Moscow's strikes on Kyiv earlier this week.

Vladimir Putin calls a three-day ceasefire in May, coinciding with events marking the 80th anniversary of World War Two's end.

President Trump "wants to see a permanent ceasefire first, to stop the killing, stop the bloodshed," press secretary Karoline Leavitt said.

After being accused of violating the last short-term truce, President Vladimir Putin says Russia will halt its war in Ukraine for three days to mark 80 years since the defeat of Nazi Germany.