WNBA star has been detained since February
Cherrelle Griner has questioned efforts to secure WNBA star's release
Detained WNBA star's trial began in Russia on July 1
WNBA star faces up to 10 years in prison
Biden officials spoke to athlete's wife 'in the last few days'
Detained WNBA star's trial to begin on July 1
WNBA star detained in Moscow airport in February
HRC, GLAAD among letter signatories
Calls to embassy phone in Moscow went unanswered on Saturday
Brittney Griner, Saudi Arabia among issues discussed