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Russian military officers stand guard at a radar station at the missile defense facility in Sofrino, 50 km (31 miles) northeast of Moscow, Russia, Friday, May 4, 2012. Participants in the international conference on missile defense held in Moscow, visited the missile defense facility in Sofrino on Friday. NATO's secretary general says Russia has nothing to fear from a planned missile defense system in Eastern Europe and should cooperate with the Western military alliance. On Thursday, Russia's top military officer, Chief of General Staff Nikolai Makarov, threatened a pre-emptive strike on the facilities if NATO goes ahead with its plans.(AP Photo/Mikhail Metzel)