 Complete the following phrase:  In 2010, a series of protests across North Africa and the Middle East known as the Arab Spring broke out, eventually turning into more severe forms of unrest in several countries. Obama helped organize a NATO-led intervention in Libya, ultimately resulting in the fall of Muammar Gaddafis regime. Obama declined to become deeply involved in Syrian civil war between the government of Bashar al-Assad, the Syrian opposition, and the Salafi jihadist group known as ISIS. The U.S. supported the opposition throughout the civil war and occasionally executed strikes against ISIL. In 2014, after Russia annexed Crimea and intervened in Ukraine, Obama and other Western leaders imposed sanctions that contributed to a Russian ficial crisis. Russia later 