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 meeting inside St. Peter’s Basilica marked the presidents’ first face-to-face meeting since a tense February Oval Office meeting, and also took place as Trump has put pressure on Zelenskyy to accept his terms for peace negotiations, which would allow Russia to control Ukrainian territory it seized by warfare.