The US Navy needs multi-mission, long-range autonomous warships that can traverse and fight across the vast waters of the Pacific.

KYIV, Ukraine (AP) — Ukrainian drones struck a major oil refinery in Russia’s Volgograd region for the second time in almost three months, Ukraine’s general staff said Thursday. Russian officials did not confirm the attack, although the local governor said drones started a fire at an unspecified industrial facility in the region.

Sesame Solar develops mobile, off-grid power solutions for defense and commercial partners. Heven AeroTech is involved in the development of hydrogen-powered unmanned aerial systems, also known as drones.

HUR claims that the drone strike on Nov. 6 led to a fire in the workshop producing an additive known as agidol, used for aviation fuel.

Ukraine has relied on its armed naval drones to battle Russia's Black Sea Fleet in a display of asymmetric warfare.

The drone incursions and the instability on NATO’s eastern flank stem from Russia’s war in Ukraine, now approaching the end of its fourth year. The conflict has become a crucible for drone development, transforming the battlefield into a testing zone for new technology which now has applications elsewhere in Europe.

Russian and Ukrainian troops fought battles on Tuesday in the ruins of Pokrovsk, a transport and logistics hub in eastern Ukraine that Moscow has been trying to capture for over a year.

KYIV/EASTERN UKRAINE, Ukraine (Reuters) -As buildings change hands in chaotic fighting in Ukraine's eastern stronghold of Pokrovsk, defending forces said this week that drones alone could not hold off Russian advances and more soldiers were needed to prevent the enemy infiltrating further.