Despite the cost of shooting down fighter jets and drones, small skirmishes remind both sides of the dangers of escalation Despite the cost of shooting down fighter jets and drones, small skirmishes remind both sides of the dangers of escalation E arlier this month, a swarm of Russian drones violated Poland’s borders. Some were shot down. A few days later, another Russian drone overflew Romania en route to Ukraine. The Romanian air defence let it get away. Then, on 19 September, three Russian