(Reuters) – U.S. basketball officials said on Saturday they were closely monitoring the situation surrounding seven-time WNBA All-Star player Brittney Griner after Russia said it had detained a U.S. player last month for possession of vape cartridges containing hash oil. Without identifying Griner, a center for the female league’s Phoenix Mercury, the Russian Customs Service said a player was detained in February after arriving at Moscow’s Sheremetyevo airport on a flight from New York. Russian news agency TASS identified the player as Griner, citing a source. The Phoenix Mercury team, without…