Sources tell NBC News President Trump discussed U.S. and NATO-like security guarantees for Ukraine as part of a possible permanent peace deal with Russia on his way back from his summit with Russian President Putin.

Documents with sensitive details about the meeting between President Trump and Russian President Putin were left behind on a public hotel printer.

Vladimir Putin and Donald Trump held a joint news conference following Russia-US talks. President of Russia Vladimir Putin: Mr President, ladies and gentlemen, We held our talks in a constructive and mutually respectful atmosphere, and they have proved substantive and productive.

In particular, cutting off the “shadow fleet” of tankers that deliver Russia’s oil under the radar would send the war economy into a “deep financial crisis,” according to Robin Brooks, a senior fellow at the Brookings Institution and former chief economist at the Institute of International Finance.

U.S. President Donald Trump and Russian President Vladimir Putin spoke face-to-face to discuss what it would take to end the war in Ukraine. Ukrainian President Volodymyr Zelensky wasn't present. Follow along for live updates,

President Donald Trump says his historic summit with Russian President Vladimir Putin was successful, but the path to peace in Ukraine remains unclear.

Dmitry Medvedev has traveled a long way from his time as Russian president, when he once stood beside then-US President Barack Obama and declared that “the solution of many world problems depends on the joint will of the United States and Russia.

The much-anticipated summit between U.S. President Donald Trump and Russian leader Vladimir Putin began with a warm welcome a military flyover but ended with a thud after the two leaders conceded they had failed to reach any agreements on how to end the Russia-Ukraine war.