Theories abound over who is responsible for the death of Russian politician Boris Nemtsov. Mr. Nemtsov, a towering figure in Russian post-Soviet politics and a biting critic of President Vladimir Putin, was gunned down in the heart of Moscow less than 100 yards from the walls of the Kremlin and within sight of Red Square, one of the most secure areas in all of Russia. Russian President Vladimir Putin said it bore the marks of a contract killing, a spokesman said. Here is what we know so far.

The Washington Post | THE WASHINGTON POST March 2, 2015
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