13 of 50: From left, Spanish Prime Minister Jose Luis Rodriquez Zapatero, Turkey's President Abdullah Gul, and British Prime Minister David Cameron sit as U.S. President Barack Obama takes his seat prior to participation in a NATO Russia Council meeting at a NATO summit in Lisbon on Saturday Nov. 20, 2010. NATO planned Saturday to deliver a historic invitation for Russia to join a missile shield protecting Europe against Iranian attack, a milestone for an alliance that was built to defend against Soviet forces.(AP Photo/Armando Franca) (AP Photo/ Armando Franca)

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