Russia began to strengthen its borders after the raids by volunteers. In particular, the occupiers began training recruits and preparing fortifications, states the Defense Intelligence of Ukraine. According to the DIU, the aggressor state intensified measures to strengthen sections of the Russian border in Belgorod, Kursk, and Bryansk regions after raids by the Siberian Battalion, the Russian Volunteer Corps, and the Freedom of Russia Legion. The personnel of the Kursk, Bryansk, and Belgorod groups of Russian troops are being trained to detect and combat sabotage and reconnaissance groups, con…