Aung San Suu Kyi's opposition party urged the United Nations on Saturday to take action against human rights abuses in military-ruled Myanmar, voicing hope and frustration over the visit of another U.N. envoy. U.N. human rights investigator Tomas Ojea Quintana was scheduled to arrive late Saturday for a six-day stay that comes less than two weeks after a visit by U.N. special envoy Ibrahim Gambari and in the wake of a judicial crackdown on pro-democracy activists.