A Moscow court arrested Ukraine's interior minister in absentia Wednesday, the Investigative Committee said in a statement.
Arsen Avakov is suspected of using prohibited means of warfare and killing civilians en masse during the Ukrainian government's campaign against insurgents in the country's east, the committee said.
Earlier the same court — Basmanny District Court — arrested in absentia the governor of Ukraine's Dnipropetrovsk region, Igor Kolomoisky, who is also accused by Russian investigators of organizing the mass killing of civilians.
Russia has issued an international warrant request for the arrest of Kolomoisky and Avakov. The court rulings against the Ukrainian officials are widely seen as a political move, as Russia does not have the authority to detain foreign nationals outside Russian territory.
Moscow has repeatedly condemned the military campaign being waged by Ukrainian troops against pro-Russian rebels in the country's conflict-torn east.