Several European and NATO leaders are meeting in Washington to discuss President Trump's negotiations with Russian's Vladimir Putin, and to prevent any repeat of the last time Ukraine's president met with Trump.

That was one of the most hostile meetings ever between a U.S. president and a visiting head of state.

Today, the two Western leaders met at the White House for the first time since then.

WATCH: Trump and Zelenskyy Meet in White House Following Meeting with Putin in Alaska

Trump is continuing to pressure Zelenskyy, writing on Truth Social that the Ukrainian president "...can end the war with Russia almost immediately, if he wants to, or he can continue to fight."

Zelenskyy responded overnight, writing, "Russia must end this war, which it itself started. And I hope that our

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