NBC News joined a NATO flotilla as it sailed the icy sea hunting Russian saboteurs accused of targeting undersea cables.

The deal was limited, and it was not clear when or how it would start. The Kremlin also demanded some Western sanctions be ...

The agreement appears to mark a revival of a 2022 agreement to ensure safe transit via Ukraine’s Black Sea ports.

Pacific oysters are adapting to less salty waters and may soon spread into the Baltic Sea, aided by warmer seas and genetic ...

Russia and Ukraine have agreed to "ensure safe navigation" and "eliminate the use of force" in the Black Sea, in a deal ...

The device integrates seamlessly with China's advanced crewed and uncrewed submersibles, such as the Fendouzhe and Haidou ...

Western officials have accused Russia and its proxies of staging dozens of attacks and other incidents across Europe since ...