Ukrainian President Volodymyr Zelenskiy said his brief meeting with U.S. counterpart Donald Trump on the sidelines of Pope Francis’ funeral at the Vatican a week ago was the best that the two men have had together.

As thousands of mourners gathered outside St. Peter’s Basilica for the funeral of Pope Francis, two presidents sat huddled inside amid the near-silence, beneath an 18th century painting of the baptism of Jesus.

Volodymyr Zelensky has said his meeting with Donald Trump at the Vatican was the “most substantive” conversation the two have had so far. The pair reportedly covered a wide range of topics, from Russian sanctions to a proposed 30-day ceasefire between Kyiv and Moscow,