FILE - In this Nov. 4, 2012, file photo, rebel fighters watch as smoke rises after Syrian government forces fired an artillery round at a rebel position during heavy clashes in the Jedida district of Aleppo, Syria. Tensions between the U.S. and Russia have been rising. The countries have been at odds over Syria’s civil war, Iran’s nuclear program and Russia’s crackdown on domestic opposition. U.S. officials are uneasy about what they see as a more assertive foreign policy by Vladimir Putin, who returned to the Russian presidency in May. (AP Photo/Narciso Contreras, File)

Associated Press
FILE - In this Nov. 4, 2012, file photo, rebel fighters watch as smoke rises after Syrian government forces fired an artillery round at a rebel position during heavy clashes in the Jedida district of Aleppo, Syria. Tensions between the U.S. and Russia have been rising. The countries have been at odds over Syria’s civil war, Iran’s nuclear program and Russia’s crackdown on domestic opposition. U.S. officials are uneasy about what they see as a more assertive foreign policy by Vladimir Putin, who returned to the Russian presidency in May. (AP Photo/Narciso Contreras, File)
FILE - In this Nov. 4, 2012, file photo, rebel fighters watch as smoke rises after Syrian government forces fired an artillery round at a rebel position during heavy clashes in the Jedida district of Aleppo, Syria. Tensions between the U.S. and Russia have been rising. The countries have been at odds over Syria’s civil war, Iran’s nuclear program and Russia’s crackdown on domestic opposition. U.S. officials are uneasy about what they see as a more assertive foreign policy by Vladimir Putin, who returned to the Russian presidency in May. (AP Photo/Narciso Contreras, File)
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