A Russian Kilo-class submarine.

REUTERS/Murad Sezer

Russia has equipped submarines at a major Black Sea base with anti-drone cages in an apparent effort to protect them from Ukrainian deep strikes, according to a new Western intelligence assessment.Britain's defense ministry said on Friday that an analysis of satellite imagery dated between June 6 and 9 revealed counter-drone cages covering the conning towers of three Kilo-class submarines at the Novorossiysk naval base.Britain said "it is almost certain" that a fourth submarine at the base will receive similar equipment. A satellite image published by the defense ministry showed two of the vessels outfitted with cages.

An annotated image of the Novorossiysk base.

UK Ministry of Defense/Screengrab via X