
Russia has built "extensive systems of military defensive works" in southern regions bordering with Ukraine, indicating the Kremlin's "deep concern" Kyiv's spring counteroffensive could mark a "major breakthrough" in the conflict, according to the latest intelligence update from Britain’s defense intelligence agency on Monday.
The update said Moscow has constructed some of the most sprawling and complex defensive trenches "seen anywhere in the world for many decades," along the northern border of annexed Crimea, and "well inside" Russia's southern Belgorod and Kursk regions.
"These defences are not just near the current front lines but have also been dug deep inside areas Russia currently controls," the agency said in an assessment shared on Twitter Monday. It added that construction started in summer 2022, several months after Russia launched its brutal military campaign.
The defences highlight Russian leaders’ deep concern that Ukraine could achieve a major breakthrough," the ministry said.
"However, some works have likely been ordered by local commanders and civil leaders in attempts to promote the official narrative that Russia is ‘threatened’ by Ukraine and NATO."
Some background: Satellite imagery reviewed by CNN and other news organizations shows the extent of Russian defenses that have been built up in parts of southern Ukraine – layers of anti-tank ditches, obstacles, minefields and trenches.
The defenses continue for hundreds of miles across the meandering southern front – where Ukrainian forces are expected to concentrate their counter-offensive in the coming weeks.
Such defenses, however, are only as good as the forces assigned to each sector. On their own they are a limited impediment. Which is why the Russians have pushed more units into southern Ukraine. These defensive lines have become critical to their overall goals.
Read more on the spring offensive here: