Britain on Wednesday imposed sanctions on six individuals in charge of the Arctic penal colony where Russian opposition leader Alexei Navalny died last week, Reuters reports.
Western leaders have expressed outrage at the news from Russian authorities that Navalny, President Vladimir Putin's most prominent domestic critic, had fallen unconscious and died in prison on Friday.
Those sanctioned, including the head and five deputy heads of the penal colony, will be banned from the UK and have their assets frozen, British Foreign Secretary David Cameron said in a statement.
"Those responsible for Navalny's brutal treatment should be under no illusion - we will hold them accountable."
Cameron had vowed action on the matter on Saturday, while London summoned the Russian ambassador to make clear it held Russian authorities "fully responsible" for Navalny's death.
The European Union also moved closer this week to imposing new sanctions against Moscow over its war on Ukraine, as Navalny's widow Yulia Navalnaya said Putin must be held accountable.
Germany, Lithuania and Sweden were among EU countries calling for specific new penalties against Russia over Navalny's death.
Britain has imposed sanctions on more than 1,700 people and entities under its Russia sanctions regime since Russia's full-scale invasion of Ukraine in February 2022, the government said.
EU members approved a 13th package of Ukraine-related sanctions against Russia on Wednesday, banning nearly 200 entities and individuals accused of helping Moscow procure weapons or of involvement in kidnapping Ukrainian children.
