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Detained American Paul Whelan told CNN he is “disappointed” the Biden administration has not done more to secure his release, meaning he’s been left behind in Russia after weed-smuggler WNBA player Brittney Griner was freed on Thursday.

“I am greatly disappointed that more has not been done to secure my release, especially as the four-year anniversary of my arrest is coming up. I was arrested for a crime that never occurred,” he said in an exclusive phone call from the penal colony where is being held in a remote part of Russia. “I don’t understand why I’m still sitting here.”

Whelan said he was happy that Griner was released.