Brittney Griner Sent To Russian Penal Colony To Serve Sentence

Greiner pleaded guilty to drug possession in August and was sentenced to 9 years in prison. After losing her appeal, she is being transferred to a penal colony with harsher conditions. U.S. officials are attempting to secure her release through a prisoner swap, but no agreement has been reached yet.

What efforts have U.S. officials made regarding Greiner's situation?

What has been the outcome of the attempts to secure a prisoner swap for Greiner?