Russia's Summer Offensive. What is known about the enemy's main trump card?

What is the Russian army up to this time?
In recent months, Russian invaders have continued to advance in various regions of Ukraine.
What is important to understand is that the enemy's key breakthroughs took place in the Sumy region, where about 200 km² of territory was captured.
Moreover, for the first time since the start of the full-scale invasion, the Russian army reached the border of the Dnipropetrovsk region.
As journalists note, one of Russia's main trump cards during this offensive was fiber-optically controlled attack drones.
Their peculiarity is that they do not react to Ukrainian electronic warfare equipment, because they do not transmit a signal via radio waves.
A Ukrainian drone unit commander, speaking on condition of anonymity, commented on this matter:
At the moment you're lucky if you drive five kilometers from the front line and your car still works. That's how they work, everything else is the exception now.
We also cannot ignore the fact that Russian drones are striking logistical targets 30–40 km deep into Ukrainian territory.
They were the ones who carried out attacks on Ukrainian trucks, and also destroyed warehouses on the road between Kramatorsk and Dobropillya.
Commanders at the front, particularly near Siversk, banned any daytime traffic, allowing it only "during the gray hours of the day and in the dark."
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