Russia’s launch of the nuclear-powered submarine Khabarovsk is poised to become one of the most acute challenges facing Britain’s Royal Navy in the coming years, according to reporting by the Financial Times.

The publication notes that military analysts view the vessel as a disruptive presence capable of moving through the world’s oceans with minimal detection, which they consider a major threat for the United Kingdom’s naval forces. The submarine’s appearance has sparked intense debate and unease within defense circles.

The FT points to the technological upgrades behind this concern: Russian nuclear submarines, it reports, have seen their acoustic signature dramatically reduced in recent decades. This has been attributed to new waterjet propulsion systems, composite hull coatings, and improved reactor coolant pumps, which-taken together-have brought noise levels close to complete silence.

In early November 2025, Khabarovsk was launched in Severodvinsk. The submarine was purpose-built to carry and deploy the Poseidon nuclear underwater system.

Russian President Vladimir Putin first disclosed the development of the unmanned nuclear Poseidon devices in his 2018 address to the Federal Assembly. At the time, he said these underwater drones could be equipped with either conventional or nuclear warheads, enabling them to strike a wide range of targets, from carrier groups to coastal infrastructure.

In October 2025, the Russian leader announced that the system had successfully undergone testing.