Russian officials confirmed for the first time publicly that North Korean soldiers have been fighting alongside them in the war in Ukraine, as U.S. President Donald Trump shows his patience is running thin with Russia on peace talks in Ukraine.

Trump criticized Russian President Vladimir Putin for “shooting missiles into civilian areas” in a post on Truth Social Saturday morning, hours after he met with Ukrainian President Volodymyr Zelenskyy.

The White House said their discussion was “very productive” and that more details would be released later. The meeting lasted about 15 minutes inside St. Peter’s Basilica at the Vatican just before they took their seats for the outdoor funeral service. Zelenskyy said “good meeting” on social media after the funeral.