For decades, U.S. involvement in Libya has oscillated between neglect and fleeting moments of attention and resolve. But so far, the second Trump administration has displayed a surprising degree of interest in the oil-rich country. It appears to want to end the long-standing stalemate between Libya’s two ruling factions—the UN-recognized government of Prime Minister Abdulhamid Dabaiba in the west in Tripoli and the domain of Field Marshal Khalifa Haftar, based in the eastern city of Benghazi. In the past year, this push has been spearheaded by Massad Boulos, U.S. President Donald Trump’s senior adviser for Arab and African affairs. After rounds of shuttle diplomacy, Boulos announced an apparent breakthrough earlier this month: the two rival governments had agreed on a unified budget for the first time in years.…