You could almost hear the clock ticking last week as diplomats scrambled to find a solution to end the killing in Darfur, western Sudan. In late August, the United Nations Security Council passed a resolution calling for a U.N. peacekeeping

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nginx/1.14.0 (Ubuntu) force to deploy across the region, where more than 200,000 people have been killed in three years of fighting between rebel groups and government-backed Janjaweed militiamen, whom human-rights groups and the U.S. accuse of murdering, raping, looting and even genocide.

But Sudan's government in Khartoum has said U.N. troops are not...