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NOVOROSSIYSK, RUSSIA (DEC. 15, 2025) (UKRAINIAN SECURITY SERVICE - RESTRICTED)

1. VARIOUS OF MOMENT OF RUSSIAN SUBMARINE EXPLODING AT PORT NOVOROSSIYSK, RUSSIA - DECEMBER 15: Ukraine said an underwater drone strike disabled a Russian submarine in the Black Sea port of Novorossiysk, alleging the vessel sustained “critical” damage and was left out of service.

Footage released by Ukraine’s Security Service (SBU) on Monday, Dec. 15, reportedly shows the moment of the attack at the port.

In a statement posted on social media, the SBU said unmanned sea vehicles were used to hit a Project 636.3 submarine — also known as the Varshavyanka - describing it as the first time it has conducted such an operation with underwater strike drones.

The agency claimed the targeted submarine was equipped with four launchers for Kalibr cruise missiles, which it said Russia used to strike Ukrainian territory.

The SBU also put the submarine’s value at around $400 million, adding that building a comparable replacement could cost more under sanctions.

Russia started its "special military operation" in Ukraine in February 2022 to "denazify" and "demilitarize" Ukraine.

According to its memorandum for the settlement of the conflict, Moscow has demanded a ban on Kyiv joining military alliances and withdrawal of Ukraine's troops from Donetsk, Luhansk, Zaporizhzhia, and Kherson, the regions it annexed after a referendum in September 2022, among others.

Ukraine has called the terms an "ultimatum" and has called for a ceasefire as a prerequisite for meaningful talks.