Russia's aggression on display in Sloviansk.

As the summer heat approaches, the 10th Mountain Assault Brigade is bracing itself for one of the most intense battles of its four-year-long war against the Russian invaders. But little do we know, the fate of Sloviansk, a strategic city in Ukraine's Donbas region, hangs in the balance. In a chilling revelation, Dmytro "Lifecell," the 44-year-old head of artillery reconnaissance, drops a bombshell: "The Russians have the task of starting the occupation of Sloviansk in the summer." The words send shivers down the spines of Ukrainian soldiers, who know all too well the horrors of war. What's about to unfold will be a battle for the ages, and we're about to take you right to the front lines.