A few of the leaders were said to have interrupted summer holidays to fly to the United States on less than 24 hours’ notice to meet with the Ukrainian leader.

It is quite possible that Monday's meeting in the White House could prove even more crucial to the future of Ukraine - and for all of Europe's security - than last Friday's US-Russia summit in Alaska. On the surface, that Putin-Trump reunion seemed to live down to every expectation.

Ukrainian President Volodymyr Zelensky joined European and NATO leaders to thank Trump — a lot — six months after the White House accused him of being ungrateful.

President Volodymyr Zelensky of Ukraine and other European leaders have learned a thing or two about negotiating, Trump-style. So has Vladimir Putin.

Ukraine's Volodymyr Zelenskyy and top European leaders are in Washington for make-or-break meetings with President Trump over the Russian invasion.