The naval aviation also reverted the decision to divest its fighter air arm (but not its bomber aircraft, which remain with the Air Force). MiG-31 were transferred back to the Navy and new Su-30SM heavy multirole fighters were ordered. These aircraft were grouped into fighter aviation regiments independent from the air bases. As of 2019 the naval aviation air bases consist of maritime patrol and ASW aircraft, transport aircraft, ASW helicopters, combat and assault helicopters, transport helicopters and UAVs. Naval aviation is following the air force in the resurrection of the air divisions as an operational level of command and control. It is yet undecided whether the naval aviation air bases will become air divisions, reforming their fixed wing, helicopter and UAV assets in aviation regiments and squadrons or new composite naval aviation divisions will be formed and the NAABs will be subordinated to them next to the fighter aviation regiments.