[1/3]U.S. Ambassador to the United Nations Nikki Haley speaks following a vote on a U.N. Security Council resolution to expand its North Korean blacklist after the Asian state's repeated missile tests, at the U.N. headquarters in New York, U.S., June 2, 2017. REUTERS/Mike Segar Acquire Licensing Rights GENEVA (Reuters) - The United States is expected to signal on Tuesday that it might withdraw fro