Ukraine’s Security Service (SBU) said it has struck a Russian submarine in the Black Sea port of Novorossiysk using underwater drones, calling the operation a major breakthrough in naval warfare. Ukrainian authorities released video footage showing a near-surface explosion alongside a vessel, which Kyiv claims was a modern Russian submarine valued at up to $400 million. According to the SBU, the attack was carried out using “Sea Baby” underwater drones, a Ukrainian-developed system designed for stealth operations against naval targets. The agency said the blast left the submarine critically damaged and unable to operate. “This is the first time a...