Nerve agents, poison and window falls. Over the years, Kremlin foes have been attacked or killed

The attacks range from the exotic - poisoned by drinking polonium-laced tea or touching a deadly nerve agent - to the more mundane of getting shot at close range. Some take a fatal plunge from an open window.Over the years, Kremlin political critics, turncoat spies and investigative journalists have been killed or assaulted in a...