Even everyday Republicans are now more positive than Democrats toward Russia, according to several opinion polls.
While an improving tenor in official relations could lead Russians to warm to the United States, American public opinion may be more resistant.
Its greatest vulnerability is its economy, so strong sanctions will hurt, writes Ivo Daalder.
Nearly 50 years ago, at the height of the Cold War, former U.S. ambassador to NATO Harlan Cleveland wrote a book called "NATO: The Transatlantic Bargain."
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