Security Service of Ukraine, or SBU, is Ukraine's special purpose law enforcement agency and main government security agency in a sphere of counterintelligence activity and combating terrorism. The Security Service of Ukraine is vested, within its competence defined by law, with the protection of national sovereignty, constitutional order, territorial integrity, economical, scientific, technical, and defense potential of Ukraine, legal interests of the state, and civil rights, from intelligence and subversion activities of foreign special services and from unlawful interference attempted by certain organizations, groups and individuals, as well with ensuring the protection of state secrets.