Neither Russian President Vladimir Putin nor U.S. President Donald Trump look likely to attend peace talks that were due to be held in Turkey on Thursday.

After Mr. Trump expressed frustration with Russia’s refusal to stop the war, Mr. Putin ordered a three-day cease-fire to begin on May 8, in order to mark the May 9 celebration of the Soviet Union’s victory over Nazi Germany in World War II. Mr. Zelensky described that pledge as a “ manipulation .”

A low-level Russian team has been dispatched to Istanbul, but direct talks with Ukraine are still uncertain.