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U.S. Brokers Cease-fire in Western Afghanistan  KABUL (Reuters) - The United States has brokered a  cease-fire between a renegade Afghan militia leader and the  embattled governor of the western province of Herat,  Washington's envoy to Kabul said Tuesday.  "Our expectation is that the agreement that has been made will  be honored," said ambassador Zalmay Khalilzad, adding that the  cease-fire was due to take effect at 4 p.m. 