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How the US left Ukraine exposed to Russia's winter war Will Europe use frozen Russian assets to fund war? How can Ukraine rebuild China ties? Ukraine has carried out a successful underwater drone strike on a Russian submarine in the port of Novorossiysk, causing critical damage to the vessel, its domestic security service says. In a statement on Monday, the Security Service of Ukraine (SBU) said the Kilo-class submarine was knocked out of operation in the first such attack by Sea Baby drones. The SBU said the submarine "carried four Kalibr cruise missile launchers" used to strike Ukrainian territory.

Virtual assistants such as Apple's Siri or Amazon's AMZN Alexa have become popular technological helpers. Ask a virtual assistant to find a restaurant or tell you today's weather, a soothing AI voice obligingly responds. So why not a virtual assistant to help the U.S. Navy find Russian and Chinese submarines? The Navy wants a virtual assistant -- like the ones found on consumer smartphones -- to help overloaded sonar operators manage multiple anti-submarine warfare (ASW) systems. In particular, active sonar on Navy cruisers and destroyers come with a variety of settings.