Ukrainian sea drones attacked a major Russian port on the Black Sea on Friday, damaging a naval ship, according to a Ukrainian official, the latest in a series of strikes inside Russia as Kyiv vowed to bring the fight home to them. Moscow claimed it repelled the attack.

The strike on Novorossiysk marks the first time a commercial Russian port has been targeted in the 18-month war. The port — which hosts a naval base, shipbuilding yards and an oil terminal and is key for exports — lies just across the Black Sea from Crimea, where Russia’s Defense Ministry said it thwarted another attack overnight, taking down 13 drones.