Russian opposition politician Vladimir Kara-Murza is being investigated for treason, his lawyer was quoted as saying on Thursday, as authorities step up their case against him for speaking out against the war in Ukraine.
State-owned news agency RIA quoted lawyer Vadim Prokhorov as saying a criminal case for treason - which carries a sentence of up to 20 years - had been opened against Kara-Murza in connection with three of his public speeches.
