U.S. Iran envoy Brian Hook stepping down as key U.N. arms embargo vote looms
US Iran Envoy Brian Hook Stepping Down, to Be Replaced by Elliott
U.S. Iran envoy Brian Hook stepping down as key U.N. arms embargo
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US Iran Envoy Brian Hook Stepping down, to Be Replaced by Elliott
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Top U.S. diplomat for Iran resigns ahead of U.N. arms embargo vote
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