By Andrew Higgins

Beset by mounting casualties on the battlefield and deepening disquiet at home over the United States' longest war, President Obama's Afghan policy now faces another big headache: the unraveling of central authority in Kyrgyzstan, a Central Asian nation that hosts a U.S. air base critical to the battle against the Taliban.

Just a month after agreeing to extend for a year a $60 million lease on a U.S. air base here, Kyrgyzstan's generally pro-Western but increasingly impotent president, Roza Otunbayeva, has retreated from U.S.-backed security programs that Washington hoped would help fortify a fragile Kyrgyz government.

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