President Donald Trump invited European leaders to join his meeting with Ukrainian President Volodymyr Zelenskyy on Monday afternoon at the White House, a White House official said.

The meeting comes after Trump's summit with Russian President Vladimir Putin in Alaska on Friday.

-ABC News' Hannah Demissie

After meeting with President Donald Trump in Alaska, Russian President Vladimir Putin told Kremlin officials the summit was "timely and very useful," saying the two talked about "all aspects of our cooperation" along with a "possible resolution of the Ukrainian crisis on a fair basis."

Regarding the Russia-Ukraine war, Putin said he and Trump talked about the "genesis and the causes of this crisis," saying "it is the elimination of these root causes that should be the basis for a settlement."

"The conversation was very frank and informative, and I believe that it brings us closer to the necessary solutions," Putin said.

Putin added that he respects "the position of the American administration, which sees the need to end the hostilities as soon as possible."

-ABC News' Somayeh Malekian

After National Public Radio released a report saying papers about the Alaska summit were found on a hotel printer ahead of the meeting between President Donald Trump and Russian President Vladimir Putin, the White House released a statement, calling the report “hilarious.”

“It’s hilarious that NPR is publishing a multi-page lunch menu and calling it a ‘security breach.’ This type of self-proclaimed ‘investigative journalism’ is why no one takes them seriously and they are no longer taxpayer-funded thanks to President Trump,” White House spokeswoman Anna Kelly said in a statement.

NPR had reported the eight pages – that appear to have been produced by U.S. staff – were left behind accidentally and contained precise locations and meeting times of the summit and phone numbers of U.S. government employees.

-ABC News’ Benjamin Siu and Hannah Demissie

First lady Melania Trump penned a personal letter to Russian President Vladimir Putin raising concerns over children abducted during the Russia-Ukraine war, two White House officials tell ABC News.

President Donald Trump hand delivered the letter to Putin during their summit in Alaska, those officials said, but did not provide further details about the contents of the letter.

Ukrainian President Volodymyr Zelenskyy has said thousands of children have been kidnapped by Russia.

“We cannot reach an agreement with them on the return of the children,” Zelenskyy has stated.

The first lady was not on this trip, but the president often talks about how his wife reminds him of the brutality of Russia's attacks on Ukraine.

“I go home, I tell the first lady, ‘I spoke to Vladimir today, we had a wonderful conversation.’ And she says, ‘Oh really, another city was just hit,'” the president said weeks ago.

-ABC News’ Rachel Scott