Vladimir Kara-Murza, one of Russian President Vladimir Putin's most high-profile and fiercest critics, has been sentenced to 25 years in jail after being found guilty of treason and other offences, following a secret trial in Moscow.
The 41-year-old pro-democracy activist was arrested in April last year after he described Mr Putin's administration as corrupt, kleptocratic, authoritarian and a "regime of murderers" during an interview on CNN.
