Among the Americans in Russian custody is WNBA star Brittney Griner, and Secretary of State Antony Blinken urged other Americans to leave the country while the U.S. is working to bring detained Americans home. Griner was arrested and detained at a Moscow-area airport after authorities accused her of transporting drugs. It’s unclear when the arrest took place, though reports have said officials found marijuana vape cartridges on her. Griner plays for both Russian team UMMC Ekaterinburg and the WNBA’s Phoenix Mercury, the latter of which said Saturday that it was “aware of and closely monitoring…