Trump sounded positive on Monday as he met with Ukrainian President Volodymyr Zelenskyy and European leaders at the White House, just two days after his summit with Russia's Vladimir Putin in Alaska. "I think President Putin will make peace. I think President Zelensky will make peace. We'll see if they can get along," Trump said.

Other lower level meetings planned for this week underscore the massive task ahead for European allies as they weigh plans for sending a peacekeeping force to Ukraine.