Last Saturday Gen. Yury Baluyevsky, chief of Russia's General Staff, issued an ominous warning. Were the U.S. to launch a rocket from the missile defense system it plans to deploy in Poland to intercept Iranian rockets, it might accidentally trigger a retaliatory attack by Russian nuclear ballistic missiles.

This was only the most recent of a series of provocative and disturbing messages from Moscow. In fact, at no time since the end of the Soviet Union in 1991 has the direction of Russian policy been as troubling as it is today.

What accounts for this change? And where will it lead?

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