At what was billed as an “historic” presidential summit, hastily put together in Alaska on Friday afternoon, the optics were as clear and overshadowing as the vast Chugach mountains glistening over Anchorage in the summer sun.

As President Trump touched down in Anchorage on Friday to meet with President Vladimir V. Putin of Russia over the war in Ukraine, that country’s leader, President Volodymyr Zelensky, criticized continuing Russian strikes as a sign that Moscow was not prepared to end the conflict.