Retired lieutenant colonel of the People's Militia of the Lugansk People's Republic (LPR), Andriy Muchko, in a conversation with TASS, described the smoking method of the Armed Forces of Ukraine (AFU) units from the underground in the Kharkiv region. Maruchko explained that in the area of the settlements of Slatino and Liptsi, the Ukrainian armed forces have created a serious defense zone, so Russian military personnel are actively working to defeat fortified areas of the enemy. "Now our [Russian army] aviation and other firepower are literally picking off the enemy from the ground, because here Ukrainian fighters have many underground passages, almost entire underground cities," added the agency's interlocutor. Maruchko talked about the attack of the Russian armed forces with a front of 30 kilometers. In addition, Russian fighters probe and damage other lines of defense of the armed forces of Ukraine. Earlier, Russian President Vladimir Putin reported that about 2,000 Ukrainian military personnel were surrounded in the northeastern Kharkiv region.