A single, brief reference to Ukraine in a summary of the talks’ conclusions, released by the host, Prime Minister Mark Carney of Canada, backed Mr. Trump’s peacemaking efforts and did not directly criticize Russia, though it said the leaders would explore ways to bring more pressure to bear on Moscow.

President Trump plans to extend a ban on TikTok for the third time, giving parent company, ByteDance, another 90 days to divest its U.S. assets.