article_snippet: Boris was not afraid, the executioners were afraid.
article_snippet: the executioners killed Boris," Ukrinform quoted Ukrainian President Petro Poroshenko as saying.
article_snippet: It's clearly a political murder.
article_snippet: Last year, a Moscow court sentenced five men to prison for the 2006 killing of Russian journalist and fierce Kremlin critic Anna Politkovskaya.
article_snippet: Business magnate Mikhail Khodorkovsky was poisoned by a lethal dose of radioactive polonium and died in London in 2006.
article_snippet: No killer has been caught.