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One of Congo's biggest eastern cities fell to a powerful rebel force on Tuesday, Nov. 20, in a war that may redefine the region but has produced little political action by the United Nations, the United States, and international powers that heavily support neighboring governments -- notably Rwanda, a Western darling and aid recipient -- that are backing the violence, according to U.N. experts. The fighting has displaced nearly 1 million people since the summer, and the battle for the city of Goma marks the latest episode of a long struggle by Rwandan-backed rebels to take control of a piece of the Democratic Republic of the Congo -- a struggle the rebels are now decisively winning. The fighting has also highlighted the ineptitude of the United Nations mission, one of the world's...