Meetings in Alaska and Washington were high on pomp and low on breakthroughs, but there were two potentially significant developments.

President Volodymyr Zelenskyy thanked First Lady Melania Trump for writing a letter to Russian President Vladimir Putin in which she advocated for the safety of children impacted by war. NBC News’ Monica Alba details how the first lady is influencing peace talks between Russia and Ukraine.

Before a roundtable of European leaders in Washington, President Trump was overheard on an open microphone talking to President Emmanuel Macron of France about discussions with the Russian president on the war in Ukraine.

The Ukrainian president says Monday's talks have been "constructive" as European leaders repeat calls for a ceasefire.

The White House press secretary, Karoline Leavitt, is scheduled to speak with the media at 1 p.m. ET on Tuesday, according to the White House, a day after President Donald Trump hosted Ukrainian President Volodymyr Zelenskyy and other European leaders.

Trump said he and the Russian leader spoke last week about what they see as the problems with mail-in voting. Since then, Trump has pushed again for the U.S. to end the practice.

First Lady Melania Trump penned a letter to Russian President Vladimir Putin, which was hand-delivered by President Donald Trump in Anchorage on Friday, calling on him to protect “the innocence” of children and “nurture the next generation’s hope” as his war on Ukraine continues.