The main kinds of Internal Troops were field units, various facility-guarding units, special motorized units, riot control and patrol units, and special forces like Rus. Since the 1980s, spetsnaz units were created within the VV to deal with terrorism and hostage crises. Fields units were essentially light motorized infantry, similar to respective regular army units by their organization and weapons. They and the special forces have been heavily engaged in the armed conflicts in Chechnya and the broader North Caucasus.