With a chance to make a better second impression in the Oval Office, gratitude diplomacy was front and center for Zelenskyy. In addition to thanking the president six times, Zelenskyy extended gratitude to Melania Trump for personally writing to Russian President Vladimir Putin to think about the Ukrainian children and urge peace.

President Donald Trump is scheduled on Monday to welcome Ukrainian President Volodymyr Zelenskyy to the White House for a high-stakes meeting as the U.S. president pushes for a deal to end Moscow's war on its neighbor. A host of European leaders will join the pair.

Ukrainian President Zelenskyy and other European leaders will meet with President Trump at the White House today after Trump's summit with Russian President Putin on Friday. NBC News' Yamiche Alcindor and Richard Engel report the latest.

NATO Secretary General Mark Rutte is set to travel to Washington to participate in talks between US President Donald Trump, Ukrainian President Volodymyr Zelenskyy and a number of European leaders, the Alliance confirmed on Sunday 17 August.

Presidents Trump, Zelenskyy and numerous NATO leaders held a virtual meeting Wednesday ahead of Friday's scheduled summit between Mr. Trump and Russian President Vladimir Putin.

President Trump met with Ukraine’s Volodymyr Zelenskyy and European leaders, signaling possible U.S. troop involvement and NATO-like security protections.

According to the agency, following his summit with Russian dictator Vladimir Putin in Alaska, Trump has been leaning on Ukraine to reach a peace deal with Russia, the aggressor state. On Aug. 17, Trump’s administration stated that compromises would be needed on both sides.