A starboard-bow view of the Soviet Kirov-class nuclear-powered guided-missile cruiser Frunze. MITSUO SHIBATA via Wikimedia Commons Developed in the late 1970s, Russia's Kirov-class battle cruisers are the largest and heaviest surface-combat ships in the world — and they're coming back with advanced weaponry, according to Russia's Tass news agency.

At more than 800 feet long, with a displacement of around 25,000 tons, the Kirov dwarfs any navy ship short of an amphibious assault ship or aircraft carriers. But only one, the Pyotr Veliky, is still in service.

Russian media says that another aging Kirov-class hull, the Admiral Nakhimov, is being fitted with Russia's newest antiship, antiair, and surface-to-surface missiles.

Russia intends to return the Admiral Nakhimov to its fleet in 2019, at which time the Pyotr Veliky will be docked to undergo the same upgrades.

These include missiles of the Kalibr variety that recently hit targets in Syria from the Caspian Sea, Zircon hypersonic missiles, which are slated to be ready by 2020, and a "navalized" version of Russia's S-400 missile-defense system, according to Foxtrot Alpha.

To accommodate these missiles, Russia plans to overhaul the ship's vertical-launch systems. That contract alone is worth 2.56 billion rubles, or $33.5 million, NavyRecognition.com notes.

Aerial starboard view of the foredeck of a Kirov-class ship shows four single 30 mm Gatling guns (in purple), two pop-up (lowered) SA-N-4 SAM launchers (in red), 20 SS-N-19 cruise-missile launchers (in green), 12 SA-N-6 SAM launchers (in blue), and one twin SS-N-14 antisubmarine warfare/surface-to-surface missile launcher (in yellow). These weapons systems will be updated by 2020, Russia claims. US Navy

As with all Russian military expenditures, outsiders have trouble imagining how the struggling petro-state will pay for them.

Though the Russian navy has hit several setbacks before, the Kremlin seems hell-bent on revitalizing its navy.