Free Syrian Army
As soon as the Syrian Civil War started, the Gulf States (Saudia Arabia, Qatar, Bahrain, and Kuwait) funeded the Free Syrian Army and other opposition groups, so they can overthrow the Assad regime and stop Iran from  influencing Saudia Arabia, and other Gulf States. The United States told the Gulf States to stop funding as the funded Islamist Jihad groups like Al-Nusra Front and such.