 From January 1992 he was the chief of the Security Service of Ukraine (SBU) regional directorate in the Ternopol Oblast.From August 1993, Radchenko was the chief of the SBU Directorate for Combating Corruption and Organized Crime.Since March 1994 he was the deputy head of the SBU and chief of Directorate for Combating Corruption and Organized Crime, promoted to lieutenant general.