The shaky debut last week of a new unity government in Libya brings Western nations, including the United States, much closer to a renewed military mission there, and to a host of obstacles that will test their ability to secure a country gripped by Islamist extremism and civil war. Tensions ran high on Wednesday after Fayez Serraj, a little-known Libyan technocrat selected as prime minister in a United Nations peace process, arrived by boat in Tripoli from Tunisia. Western officials hailed his installation in the Libyan capital as a sign that the country’s two-year political divide is finally coming to an end — despite the existence of rival governments in Tripoli and the country’s east. The United States and European allies, including Italy, France and Britain, have […]