British intelligence has assessed that the Ukrainian attack on the Russian submarine Rostov-on-Don, which reportedly sank on August 3, 2024, marks the 'final chapter' for the vessel. The attack involved US-supplied Army Tactical Missile System (ATACMS) missiles and followed a series of drone strikes, with intelligence suggesting the submarine was likely not fully repaired from a previous strike in September 2023. Despite the sinking providing a morale boost for Ukraine, British analysts believe it will not significantly affect Russia's long-range maritime strike capabilities from the Black Sea. The Ministry of Defence highlighted that it is more cost-effective for Russia to build a new submarine than to repair the Rostov-on-Don. The attack underscores the increasing risks to Russian forces in Crimea, potentially forcing a reassessment of their naval deployments to the region. This incident reflects ongoing hostilities and military strategies as Ukraine continues to target high-value assets in the conflict.