U.S. President Donald Trump says he has called Russian President Vladimir Putin and begun to arrange a meeting between Putin and Ukrainian President Volodymyr Zelenskyy, a critical step toward bringing a possible end to Russia's war on Ukraine.

President Trump is set to meet with Ukrainian President Volodymyr Zelenskyy and European leaders on Monday as the U.S. pursues a peace agreement between Russia and Ukraine.

President Donald Trump on Sunday teased what he said would be a "big day" as Ukrainian President Volodymyr Zelenskyy prepares for a White House meeting.

Zelenskyy and Trump expressed hopes that talks with Ukrainian and European leaders at the White House could lead to trilateral talks with Putin to bring an end to his war on Ukraine.

Trump didn't rule out the possibility of American troops' helping to guarantee peace between Ukraine and Russia should the leaders reach an agreement.

U.S. President Donald Trump and Ukrainian President Volodymyr Zelenskyy's meeting in the Oval Office was notably different from their last encounter in February