As the Syrian government warplane flew overhead, Malik Abu Iskandaroon ran to a storage room and grabbed a Russian-made surface-to-air missile.

Moments later, on the roof of the three-story villa, which serves as air force headquarters for the Harakat Hazm rebel group, he squinted at the threat in the sky.

Missile launcher resting on his shoulder, Abu Iskandaroon prepared to fire. But in the end he refrained, as the Sukhoi fighter jet flew by, miles out of range of his older-generation weapon. As he stood by helpless, the plane fired one rocket toward the town, killing four people. […]