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The Krasnoyarsk nuclear submarine during a flag-rising ceremony at the Arctic port of Severodvinsk on December 11, 2023.
Russia will likely provide submarine technology to China, US Adm. Samuel Paparo said.
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A satellite image shows floating cranes near a pier at a Chinese shipyard.
Efforts to salvage the submarine, June 15.
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An A-10 Thunderbolt II aircraft above the ballistic missile submarine USS Wyoming on July 15.
An A-10 Thunderbolt II aircraft above the ballistic missile submarine USS Wyoming on July 15.
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A Black Russian submarine surfaces above blue and grey ocean water.
The Russian nuclear-powered submarine Kazan, part of the Russian naval detachment visiting Cuba, leaves Havana Harbour.
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A black submarine sits in the water next to a dock. Sailors walk up a ramp to get into the submarine.
Russian crew members get on board of the newly built "Novorossiysk" B-261 multipurpose diesel-electric submarine in Saint Petersburg.
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P-8A Poseidon dropping a device replicating a Mk-54 torpedo
The aircraft in the video released by Chinese state media looked like a US Navy P-8A Poseidon, and it was dropping what looked like a sonobuoy, which is a kind of acoustic sensor used to track submarines.