Kremlin: Any talks about Brittney Griner swap must be confidential

Asked if Brittney Griner could be freed as part of a prisoners swap with Washington, Kremlin spokesman Dmitry Peskov said in a conference call with reporters that "we always say that any contacts about possible exchanges can only be conducted in silence under a tight lid on any information."

In rare contact, US offers Russia deal for WNBA star Brittney Griner

The statement marked the first time the U.S. government has publicly revealed any concrete action it has taken to secure the release of Griner, who was arrested on drug-related charges at a Moscow airport in February and testified Wednesday at her trial.