Ukrainian military engineers are stretching fishing-net barriers over key roads in the eastern Donetsk region in an effort to counter a surge of Russian drone strikes, according to video footage and local officials. The low-cost mesh is designed to entangle the propellers of incoming unmanned aircraft, causing them to stall and fall before reaching their targets. Commanders say the improvised tactic has proved effective against Russian fiber-optic drones that are resistant to electronic jamming. As drone attacks intensify along the front, the netting is being installed at multiple points to protect troop movements and vital supply routes.