 The Ukrainian military conducted drills in the Chernihiv region on May 16, close to the border with Belarus. The simulated drills focused on urban warfare, one of the key elements in Ukraine's planned counter-offensive against Russian forces. Soldiers practiced fighting in an improvised settlement and and also provided first aid to simulated casualties under the watch of the commander of Ukraine's joint forces, Serhineyev. Scenarios included battlefield inoculation, which involves training under fire from real weapons and hitting a tank with a grenade. The past week has seen Ukraine make its biggest gains on the battlefield since last November, recapturing several square kilometers of territory on the northern and southern outskirts of the battlefield city of Bakhmat. Moscow has acknowledged that some of its troops have retreated but denies that its battle lines are crumbling on the city's flanks. The Russian military conducted drills in the Chernihiv region on May 16, close to the border with Belarus.