 Ukrainian guerrillas find out S-400 air defence system coordinates in Moscow. The Ukrainian guerrillas reconnoited the base of the Russian occupiers military unit and discovered the deployment of an air defence unit in the Timiryazovsky district of Moscow. It is the S-400 Triumph air defence system according to the Atezh guerrilla movement. Deployed launchers in the amount of 12 units, radar stations and universal towers for them were found. Presumably these are S-400 Triumph air defence systems, the statement says. According to Atezh, the Russians continue to keep such valuable complexes in the deep rear of Moscow while they are critically lacking at the front. They serve to cover control points of strategic importance, the guerrillas said. At the end of January 2024, the Institute for the Study of War reported that the Russian Federation would re-equip elements of its air defence system in the deep rear due to regular attacks by Ukrainian drones. In some areas there were interruptions in 4G communications. In particular, since last year, Russia has begun to actively strengthen air defence around Moscow and even installed new air defence systems. Assessing the state of Russia's air defence, the defence intelligence of Ukraine said that during the war, Russia had moved air defence systems from the Far East and the northern region to Moscow and temporarily occupied Crimea. In addition, the Russian invaders built a factory in Moscow where they planned to launch the production of air defence missiles.