[...] a step would effectively pit the Obama administration and Cuba with the world body against the Republican-led Congress, which supports the 55-year-old embargo despite the U.S. resumption of full diplomatic relations with Cuba. Obama and Castro announced on Dec. 17, 2014, that they were restoring diplomatic ties, which were broken in 1961 after Fidel Castro took power and installed a communist government. On July 20 last year, diplomatic relations were restored and embassies of the two countries were reopened, but serious issues remain, especially the U.S.