On Sunday, Secretary of State Marco Rubio, who sat in on the meetings with Mr. Putin at the American air base outside of Anchorage, disputed the idea that the Europeans were coming as a posse to protect Mr. Zelensky from a repeat of the February shouting match.

Trump and Putin met at Joint Base Elmendorf-Richardson in Anchorage, Alaska on Friday afternoon to discuss an end to Russia’s war on Ukraine, which began more than three years ago. The pair announced “great progress” had been made, but they still did not reach any kind of plan to end the war.

Ukrainian President Volodymyr Zelensky reaffirmed his demand on Saturday for tougher sanctions against Russia if there is no meeting between him and the US and Russian presidents or if Russia tries to evade ending the war.