Washington — Brittney Griner, the WNBA star who was held for months in Russian prisons on drug charges, was released Thursday in a one-for-one prisoner swap for international arms dealer Viktor Bout, bringing an end to an ordeal that sparked intensive high-level negotiations between the U.S. and the Kremlin to secure her freedom.The exchange agreement negotiated with Moscow in recent weeks was given final approval by Mr. Biden within just the last week, according to sources familiar with the deal.Griner said she didn't mean to bring the cartridges with her when she traveled to the country to play in a Russian basketball league during the WNBA offseason.After five months of stalled diplomacy and various permutations of potential swap arrangements — including a previously unreported offer by the U.S. this past summer to send two prisoners back to Russia for the two Americans — sources say the one-for-one exchange came together over the last two weeks.Griner's arrest coincided with the February start to Russia's unprovoked invasion of Ukraine, and all U.S. dealings with the Kremlin have been complicated by that conflict."