Russia is aggressively building up military presence in war-torn Syria, where the U.S.-led coalition is fighting the Islamic State. Sources told Reuters that Russian troops are now directly engaged in combat operations to support President Bashar al-Assad's regime. It significantly increases the possibility of Russian troops encountering U.S. personnel in Syria. Should the U.S. cooperate with Russia in Syria? Tensions between the U.S. and Russia have already escalated over the Ukraine crisis, and NATO is setting up military bases near Russian borders in eastern Europe. The encounter of Cold War foes on the battlefield in Syria could lead to a direct conflict between the U.S. and Russia, which in turn... More