Russia’s seapower is set to expand as navy bosses revealed Project 09852 – which is primed to be the biggest nuclear-powered sub on Earth.

The vessel – known as Belgorod – would be nearly 200-metres long and would be tasked with deep-sea exploration in the Arctic.

Putin’s new 184-metre sub will be based around the unfinished Antey-class missile strike carrier vessel developed by the Soviet Union.

— Video Russia Unveils World’s Biggest Nuclear Submarine