Inside the soaring nave of St. Peter’s Basilica on Saturday, the quiet hush of world leaders paying respects to the late Pope Francis was briefly interrupted by a flurry of activity in a secluded corner near the entrance doors.

The United States has been pushing Ukraine to accept a peace plan that seems in part a gift to Moscow. But the short meeting of the leaders, and subsequent comments, appeared to be a change in tone.

President Trump fired off rare public criticism of Russian leader Vladimir Putin and sat for a dramatic one-on-one talk with Ukrainian President Volodymyr Zelensky in the Vatican over the weekend,