Germany "sharply" condemns the sentencing of British-Russian Kremlin critic Vladimir Kara-Murza, a government spokesperson said on Monday.

Kara-Murza was sentenced on Monday to 25 years in prison after publicly condemning Russia's war in Ukraine.

"The trial against Vladimir Kara-Murza shows how the Russian justice system is instrumentalized against him and many of his compatriots and also shows what a shocking extent the repression has reached in Russia in the meantime," Andrea Sasse told journalists.

"This verdict, like many others, is aimed at the deterrence, exclusion and suppression of any critical voices," she added.

Sasse also stated that Germany demands the "immediate release of Vladimir Kara-Murza," and "all other unjustly politically imprisoned people."