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Brittney Griner, the American W.N.B.A. star who has been detained in Russia since February, recently sent a letter to President Biden. \u201cI\u2019m terrified I might be here forever,\u201d she wrote.\n\nThe White House vowed to use \u201cevery tool\u201d to bring Ms. Griner back to the United States, but organizing her release is a tricky proposition, complicated not least by Washington\u2019s break with Moscow over the war in Ukraine.\n\nGuest: Michael Crowley, a diplomatic correspondent for The New York Times.