Currently, only the navies of Russia and the United States operate modern vessels classified as cruisers. Russia currently has seven, one ( Admiral Lazarev) is afloat but has been inoperative for years and another that only nominally in commission and has not put to sea since 1991 ( Admiral Ushakov). The fourth Slava class, (Slava-class Admiral Lobov), is owned by Ukraine and remains uncompleted at its construction shipyard. Kirov class The vessels of the are the world's largest cruisers, and for this reason they are generally referred to as battlecruisers. Two Kirov battlecruisers are currently in service, and . In the last six years, Pyotr Velikiy has participated in numerous military exercises, with President Vladimir Putin being on board during the last one. The older Admiral Nakhimov was repaired and returned to service in 2005; the ship is currently undergoing upgrade renovations and should return to active service in the late 2010s. Kirov-class battlecruisers are outfitted with a very large number of weapons systems as well as modern electrical equipment, and are fully capable of fighting a large number of sea-, subsea-, air- and land-based enemy targets. Laid up, written off Admiral Ushakov In service, undergoing overhaul In service Slava class The was designed as a less radical back-up to the aforementioned Kirovs, providing most of the facilities of the larger ships in a considerably smaller, gas turbine-powered hull. The main armament is made up of sixteen SS-N-12 "Sandbox" launchers, mounted in eight pairs on either side of the forward superstructure. These launchers are fixed at an angle of some 15°. Over-the-horizon targeting for SS-N-12 systems is provided by helicopter or Punch Bowl Satcom. The Slava class was designed as part of a new strategy of creating bastions for ballistic missile submarines. Project 1143 and 1164 ships were to protect these bastions, and the new SS-N-12 missile was designed to strike major enemy anti-submarine warfare units. One of the other major roles of this cruiser type is to hunt down and destroy enemy aircraft carriers, and other heavy ships. Her SA-N-6 Grumble long-range SAMs can defend an entire strike group against enemy aircraft and missiles. Uncompleted Admiral Lobov - owned by Ukraine In service Sunk Kuznetsov class s are designated as heavy aircraft-carrying cruisers by the Russian Navy because their main strike armament is long-range anti-ship cruise missiles and the air wing is intended for defensive purposes. The flight deck