Ukrainian opposition leader Yulia Tymoshenko at a rally in Kiev, February 22, 2014.
Vasily Fedosenko / Courtesy Reuters

THE SOURCES OF RUSSIAN CONDUCT

Sixty-one years ago, a telegram arrived at the State Department from the U.S. embassy in Moscow. Its purpose was to examine the sources of the conduct of the men who ruled in the Kremlin. Its impact was immediate. The "Long Telegram," penned by a young diplomat named George Kennan, became the basis for U.S. policy toward the Soviet Union for the next half century.

Although the Soviet Union is long gone, the West is once again groping to understand what motivates the leaders in the Kremlin. Many believe that the principles behind Kennan's

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