The Russian cargo ship Ursa Major sank approximately 60 miles off the coast of Spain in December 2024, under mysterious circumstances while allegedly transporting components for two nuclear reactors intended for North Korea. The ship, which was part of Russia's so-called 'ghost fleet', had departed from St. Petersburg and was headed to Vladivostok when it encountered three explosions on its starboard side, resulting in the death of two crew members. The remaining crew was evacuated. This incident has raised suspicions of possible U.S. involvement, as U.S. military aircraft have been spotted near the wreckage, coinciding with increased tensions between Russia and North Korea, especially following the deployment of North Korean troops to assist Russia in its conflict with Ukraine. The Spanish government confirmed that the ship's captain claimed it was carrying components similar to those used in nuclear submarines, although he was uncertain if nuclear fuel was onboard. The sinking represents a significant intervention to disrupt Russian nuclear support to North Korea, a key ally.