Soviet Communist Party leader Leonid Brezhnev and U.S. President Richard Nixon walk around the grounds of Brezhnev's country home by the Black Sea in Yalta, Russia, in June 1974. Nixon had some meetings with Brezhnev without a U.S. interpreter, a practice that can lead to problems. AP hide caption

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AP

President Trump with Russian President Vladimir Putin at the G-20 Summit in Hamburg, Germany, during a formal meeting on July 7. The White House on Tuesday acknowledged that a second, previously undisclosed meeting between the leaders also took place. Evan Vucci/AP hide caption

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Evan Vucci/AP

Russia's President Vladimir Putin replies to a citizen's question during his annual Q&A Direct Line session on national television in Moscow. Anadolu Agency/Getty Images hide caption

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Russian President Vladimir Putin says "political schizophrenia" has gripped the U.S., as he discussed reports that President Trump had shared secrets with Russia's top diplomats. Mikhail Svetlov/Getty Images hide caption

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Mikhail Svetlov/Getty Images

North Korean leader Kim Jong Un attends the combined fire demonstration of the services of the Korean People's Army in celebration of its 85th founding anniversary in a photo released on April 26. KCNA via KNS /AFP/Getty Images hide caption

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KCNA via KNS /AFP/Getty Images

Secretary of State Rex Tillerson shakes hands with Russian Foreign Minister Sergey Lavrov at the start of their meeting in Moscow. Russia has accused the U.S. of breaking international law with its missile strike on Syria last week. Alexander Nemenov/AFP/Getty Images hide caption

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Alexander Nemenov/AFP/Getty Images

Senate Select Intelligence Committee Chairman Sen. Richard Burr, right, confers with ranking member Sen. Mark Warner, left, during a hearing of the Senate Select Intelligence Committee Thursday in Washington, D.C. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images

President Trump looks on as German Chancellor Angela Merkel addresses the media at a joint news conference Friday at the White House. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Russian President Vladimir Putin enters a hall in the Kremlin before a meeting in 2015. Sergei Ilnitsky/AFP/Getty Images hide caption

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Sergei Ilnitsky/AFP/Getty Images

Sensing Chaos, Russia Takes A 'Wait-And-See' Approach To Trump

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President Trump says news reports about contacts between his team and Russia's intelligence agencies are the result of conspiracy theories. Trump is seen here at the White House on Tuesday. Mark Wilson/Getty Images hide caption

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Reports: U.S. Intercepted Calls Between Trump Campaign Staff And Russian Intelligence

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Questions have loomed over National Security Adviser Michael Flynn's contact with a Russian diplomat in late December — and the explanation provided by the White House has changed over time. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images