FILE -- In this July 1, 2001 file photo, Syrian soldiers prepare an anti-aircraft gun near field of wheat close to a radar position in eastern Lebanon's Bekaa valley. Any international

 

              FILE -- In this July 1, 2001 file photo, Syrian soldiers prepare an anti-aircraft gun near field of wheat close to a radar position in eastern Lebanon
FILE -- In this July 1, 2001 file photo, Syrian soldiers prepare an anti-aircraft gun near field of wheat close to a radar position in eastern Lebanon's Bekaa valley. Any international military action against Syria’s regime over its reported use of chemical weapons would run up against one of the Middle East’s most formidable air defenses. Syrian leader Bashar Assad has modernized the system since 2007, going on a buying spree for new Russian missiles to complement thousands of anti-aircraft guns to give multi-layer protection to strategic locations _ likely a key consideration as President Barack Obama weighs the options. (AP Photo, File)