A tsunami alert was briefly issued after multiple earthquakes, some dangerously strong, struck off the southeast coast of Russia. Tsunami alerts were briefly issued after multiple earthquakes struck off the coast of Russia. The strongest of those quakes, which were measured in quick succession, came in at 7.5-magnitude on the Richter scale.

Completion of mass production of the Poseidon nuclear torpedo marks a shift in strategic deterrence and maritime warfare doctrine. Developed under Russia’s 2018 “Invincible Weapons” initiative, Poseidon combines a compact nuclear reactor for years-long autonomous operation,