Marina Litvinenko, the widow of murdered KGB agent Alexander Litvinenko, attends a demonstration in support...
Marina Litvinenko, the widow of murdered KGB agent Alexander Litvinenko, attends a demonstration in support of Boris Nemtsov, former deputy prime minister of Russia and prominent critic of Vladimir Putin, outside the Russian Embassy in London March 01, 2015. Nemstov was murdered two days ago as he walked across a bridge near the Kremlin in Moscow. REUTERS/Neil Hall (BRITAIN - Tags: CRIME LAW POLITICS TPX IMAGES OF THE DAY)