By Rick Noack in The Washington Post online, May 2, 2023 at 10.34 pmDOHA, Qatar — Twenty months after the Taliban returned to power, the United Nations is struggling to plot a course that, in part, would address Afghanistan’s humanitarian crisis without running afoul of Western countries seeking to pressure the government in Kabul to moderate its policies. Emerging from two days of talks with diplomatic envoys focused on Afghanistan, U.N. Secretary General António Guterres…