According to the information of Slidstvo.Info, the Security Service of Ukraine undertook the operation, specifically, the detention on Vitryani Hory street.
Chornobuk chaired the Appeal Court in Crimea from December 2011 until April 2014.
The Ukrainian law enforcement bodies put Chornobuk on the wanted list in July 2018.
Prosecutor General Yuriy Lutsenko claimed that the former head of the Appeal Court of Crimea is suspected of having committed an offense under the Art 111 of the Criminal Code of Ukraine (state treason). According to the Prosecutor General, Chornobuk carried out subversive activities, in particular, he helped Crimean courts to administer justice on the basis of Russian legislation.
According to the investigation, Valeriy Chornobuk cooperated with the occupation authorities during the annexation of Crimea by Russia. In particular, on March 24, 2014, at the court session, he urged judges to learn the Russian legislation and receive Russian passports.
Chornobuk himself denies the accusation of separatism.