Donald Trump hand-delivered a personal 'peace letter' written by First Lady Melania Trump to the Russian President during their meeting in Alaska.
The letter told Vladimir Putin it was "time" to protect the children of the world.
The First lady was not on the trip to Alaska, however, she made sure her thoughts were shared with the Russian President.
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Ms Trump told Mr Putin "it is time" to "protect the innocence of these children".
She added leaders needed to "strive to paint a dignity-filled world for all", according to a copy of the letter Fox News obtained.
Ukrainian children seized by Russia has been a sensitive subject.
Kyiv said the abductions of tens of thousands of its children who had been taken to Russia or Russian-occupied territory without family or guardian consent was a war crime.
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Vladimir Putin shaking hands with Donald Trump in Alaska | GETTYIt also claimed it met the UN treaty definition of genocide.
"Every child shares the same quiet dreams in their heart, whether born randomly into a nation's rustic countryside or a magnificent city-centre," Ms Trump said.
"They dream of love, possibility, and safety from danger."
The First Lady added: "As parents, it is our duty to nurture the next generation's hope. As leaders, the responsibility to sustain our children extends beyond the comfort of a few."
Melania Trump
| GETTY"Undeniably, we must strive to paint a dignity-filled world for all—so that every soul may wake to peace, and so that the future itself is perfectly guarded," she said.
Ms Trump told the Russian President it was his duty to protect children and future generations.
"A simple yet profound concept, Mr. Putin, as I am sure you agree, is that each generation's descendants begin their lives with a purity - an innocence which stands above geography, government, and ideology," Ms Trump said.
"Yet in today's world, some children are forced to carry a quiet laughter, untouched by the darkness around them—a silent defiance against the forces that can potentially claim their future."
She told Mr Putin that "you can singlehandedly restore their melodic laughter".
"In protecting the innocence of these children, you will do more than serve Russia alone - you serve humanity itself," Ms Trump wrote.
"Such a bold idea transcends all human division, Mr Putin, are fit to implement this vision with a stroke of the pen today. It is time."
Russia had previously said it had been protecting vulnerable children from a war zone.
However, Ukrainian officials have identified almost 20,000 children who have been abducted by Russia.
Some believe the number could be as high as 300,000.
The United Nations Human Rights Office has said Russia inflicted suffering on millions of Ukrainian children and violated their rights since the invasion started in 2022.
Mr Trump left a open-ended message on his Truth Social platform, declaring there had been "big progress on Russia".
He wrote that people should "stay tuned".