Security Service of Ukraine
The Security Service of Ukraine (SBU; Ukrainian: Служба безпеки України) is the principal government agency tasked with protecting Ukraine's national security through counterintelligence, counterterrorism, and the defense of state secrets and statehood.[1][2] Established in September 1991 immediately after Ukraine's declaration of independence from the Soviet Union, the SBU succeeded the Ukrainian republic's branch of the KGB, inheriting much of its personnel, infrastructure, and operational framework while undergoing initial reforms to align with the new sovereign state's priorities.[3][4] As a non-military law enforcement body subordinate to the President of Ukraine, the SBU's mandate—formalized by legislation in March 1992—encompasses detecting and preventing threats such as espionage, terrorism, organized crime, and subversion against the constitutional order, with a focus on internal security rather than foreign intelligence gathering.[2][5] The agency maintains regional departments across Ukraine and specialized units, including the Alpha counterterrorism group, and has been central to efforts combating Russian hybrid warfare since the 2014 annexation of Crimea and the ensuing Donbas conflict, neutralizing networks of agents and saboteurs amid ongoing reforms to enhance oversight and reduce politicization inherited from its Soviet-era roots.[6][7] Despite its pivotal role in safeguarding sovereignty, the SBU has faced criticism for past inefficiencies and alleged ties to oligarchic influences, prompting legislative pushes for modernization to prioritize apolitical counterintelligence functions.[8][9]