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U.S. Ambassador to Ukraine Geoffrey Pyatt. Plus, a look at Vladimir Putin's international image.
New York (CNNMoney) – Diane Sawyer will step down from ABC's flagship nightly newscast, "World News," in August, ABC said Wednesday.
David Muir, the weekend "World News" anchor, will replace her starting September 2.
The announcement ends months of speculation about a transition at ABC's anchor desk.