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When Mr. Obama took office, the government of Kyrgyzstan, under Russian pressure, threatened to close the Manas air base that NATO countries use for resupply into Afghanistan.

“On Iran, the only reason we have sanctions was because the Russians went along with the U.N. sanctions,” Ms. Hurlburt said.

She added: “U.S. and Russian re-engagement on nuclear weapons was both bilaterally useful and essential to even restart the global conversation on the role of global nuclear weapons. We needed the reset for that as a global priority.”