By Alissa de Carbonnel MOSCOW (Reuters) - Disputes between Russia and the West over arming warring sides in Syria on Tuesday dimmed prospects for peace talks that were also clouded by disarray among President Bashar al-Assad's political foes. As Western nations debate what action, if any, they should take on Syria, Assad's main allies - Russia, Iran and Lebanon's Shi'ite Hezbollah group - have been closing ranks behind him. ...