A former top official of Crimea's occupation administration was detained in Kyiv on January 5.
TV channel Straight said with a reference to referring to the SBU that Pyotr Mikhalchevskyy brifly headed Crimean health ministry in 2014.
He was found living in a residential building in Kyiv's Voskresenska St.
The head of the occupation authorities in Simferopol, Serhiy Aksenov fired Mikhalchevsky in June 2014 over "the overestimation of prices for medicines in Crimean pharmacy chains and the practice of collecting voluntary contributions from medical patients.
The press service of the SBU confirmed later in the day the detention of Mikhalchevskyy. His apartment was searched his apartment in the framework of a probe on suspicions of separatism and high treason.
Mikhalchevskyy had a Russian passport, an official certificate with the signature of Sergey Aksenov and other incriminating evidence indicating the detainee's collaboration with the occupation authorities.