Chernihiv, Ukraine CNN  — 

The loud engine announces the approach of the Soviet-era armored BTR vehicle long before it appears – racing through a grassy plain on the outskirts of Chernihiv in northern Ukraine. Suddenly it stops, its door opens and Ukrainian soldiers rush out, storming the trench below.

“Today our task is training and cleaning the trenches,” a Ukrainian soldier with the call-sign Jenia says. He is a member of Kyiv’s Offensive Guard, which is part of an initiative by the Ukrainian Ministry of Internal Affairs to establish new assault brigades.

“The enemy has lost positions, we quickly arrive, take positions, and restore it,” he adds.

This operation is just a drill, but the scenario has been engineered to be as realistic as possible. The trenches are muddy – despite weeks without rain – and the soldiers are forced to face the unexpected, such as tending to and evacuating the wounded, or adapting after suffering casualties.

“Some people say training is not hard, that there is no danger – but running through the trenches and constantly training, knowing that you will go to battle, it is not easy,” Jenia says. “Everything comes with practice, It is clear that during the hostilities there will also be the psychological impact of war – but practice is very important.”

Even as Ukrainian cities experience barrage after barrage of Russian missile and drone strikes, Jenia and the other members of the Offensive Guard have remained unfazed, simulating scenarios they expect to find once Kyiv finally launches its much anticipated counteroffensive.

A Ukrainian BTR armored personnel carrier races across a field as part of a military drill.

That day is fast approaching, if one of the top advisers to Ukraine’s President Volodymyr Zelensky is to be believed.

“There is already some sort of work underway to increase the intensity of the shelling of Russia’s logistics support in order to reduce their combat capabilities in the near future, to loosen up their defenses,” presidential adviser Mykhailo Podolyak told CNN in an interview.

The strikes Podolyak mentions are often referred to as shaping operations – so-called because they aim to ‘shape’ the battlefield – in this case, in Ukraine’s favor. CNN has previously reported that these began on May 12, citing a senior US military official and senior Western official.

“Everything that is happening now is a precursor to a counterattack, a necessary pre-condition,” Podolyak explained. “When the intensity of fire increases, especially on the logistics supplies, when the number of operations increases.”

Podolyak has refused to commit to dates, but there are clear signs the counteroffensive will begin soon.

‘Shaping’ operations ongoing

Ukraine has increased the number of strikes on Russian ammunition depots, logistical nodes and rear echelon bases, such as the ones seen in Mariupol and Berdyansk in the past few days. The military’s top general, Commander-in-Chief Valerii Zaluzhnyi, released a slickly produced video over the weekend with the caption: “The time has come to take back what belongs to us.”

In his nightly address Monday, President Zelensky said