Ukraine has claimed a historic naval success, saying its 'Sub Sea Baby' underwater drones damaged a Russian submarine at the Black Sea port of Novorossiysk.

Ukraine has claimed responsibility for a major long-range drone strike on an offshore oil platform in the Caspian Sea. This strike reportedly took place earlier in the week. The attack is described as part of an undisclosed mission.

Ukraine has used long-range drones to attack Russian oil platforms as it expands its strikes on the country's energy sector.

The Russian submarine was allegedly carrying Kalibr cruise missiles, which Russia has used in devastating strikes on critical infrastructure and military targets across Ukraine. The SBU said the submarine was “put out of action” as a result of the blast. The FT could not independently verify the claim.

Ukrainian frontline troops are innovating new drone tactics to counter Russian forces, helping them strike more effectively and conserve resources in a constrained fight.

Ukraine's drone schools are preparing soldiers to take on Russia and working to keep pace with an ever-changing fight.

A Ukrainian defence start-up has struck a €100mn deal to make tens of thousands of drones in Germany, the first such tie-up under a Kyiv initiative to help boost the output of the country’s defence companies.