Stephen Cohen, a top Russia expert who worked for former President George H.W. Bush, praised President Trump for establishing a "detente partnership" of sorts with Russian President Vladimir Putin.

Trump met with the Kremlin leader outside of the G-20 summit in Germany on Friday.

"I think it was a good summit for everyone — for American national security, for Trump’s presidency, and, of course, for Russia to the extent we share common interests with Russia," Cohen said on John Catsimatidis' show on AM 970 in New York in an interview that was released Sunday.

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Cohen said the meeting between the two world leaders was the "most faithful" one he has seen since former Presidents Franklin Roosevelt and Harry Truman met with Soviet Union leader Joseph Stalin.

Roosevelt and Truman attended conferences with the Soviet premier, which ultimately led to greater collaboration with the Soviet state during World War II.

Cohen, who is now professor emeritus of Russian studies at Princeton University and New York University, explained that the U.S.-Russia relationship has reached a historically "dangerous" low point.

"[O]ur relationship with Russia is so very, very dangerous — arguably the most dangerous since the Cuban missile crisis of 1962," said Cohen, adding that it could be "even more dangerous."

Cohen said the president was able to make progress to improve the U.S. relationship with Russia while fielding damaging allegations "that he is some kind of Russian puppet."

Cohen said while he believes these allegations are baseless, they are "a threat to our national security."

Trump called the closed-door meeting with Putin on the sidelines of the G-20 meetings "tremendous," after their talks lasted over two hours.