Kremlin critic Vladimir Kara-Murza, who was released from a 25-year prison sentence on Thursday in a prisoner swap, has spent years warning the world of the dangers of a revanchist President Vladimir Putin.
The 42-year-old journalist and opposition activist, a dual British-Russian national, was arrested soon after Moscow launched its February 2022 invasion.
Convicted in April 2023 of treason and spreading "false information" about Russia's military, he was sentenced to one of the longest prison terms ever handed down to a Putin critic.