Drone warfare has turned Ukraine's front line into a vast "kill zone," stretching up to 30 kilometers (18.6 miles) and making large-scale offensives nearly impossible.

Both Russian and Ukrainian soldiers face constant aerial surveillance and risk of attack, while vehicles and troop movements are easily detected. Ukraine uses inexpensive drones, battlefield data, and AI to inflict heavy losses and slow Russia's advance.

Experts say this shift could redefine modern conflict and forever alter defense strategies.