MOSCOW, Russia (AP) -- Russia on Saturday suspended its participation in a key European arms control treaty that governs deployment of troops on the continent, the Kremlin said, a move that threatened to further aggravate Moscow's already tense relations with the West.

President Vladimir Putin signed a decree suspending Russia's participation in the Conventional Forces in Europe Treaty due to "extraordinary circumstances ... which affect the security of the Russian Federation and require immediate measures," the Kremlin said in a statement.

http://www.cnn.com/2007/WORLD/europe/07/14/russia.treaty.ap/index.html