As of 2012, the only fixed wing strike and fighter aircraft of Russian Naval Aviation are the Su-33 fighters and Su-25UTG attack aircraft of the 279th Regiment (forming the Admiral Kuznetsov's carrier air wing), plus the Su-24 bombers based in the Crimea. This sole bomber unit remained part of Naval Aviation as an exception to satisfy treaty requirements governing Russian forces deployments on Ukrainian territory (these must be part of the Black Sea Fleet). Buying brand new multirole Sukhoi Su-30SM for the Black Sea Fleet to replace Su-24 was in the planning stages and it has been completed as of December 2016. Naval aviation also retains the anti-submarine aircraft of the forces (the Tu-142 and the Il-38) and the helicopter arm.