Inexpensive fiber-optic drones are challenging Israel’s high-tech defenses, shifting the military balance in the Middle East.

A recent video showing an explosive-laden drone striking an Israeli Iron Dome battery couldn’t have been more symbolic: Israel’s famous air-defense system, which cost billions of euros, looked powerless against a small aircraft that cost a few hundred euros.

While the video’s authenticity has not yet been verified, experts believe it is genuine.

The footage was published about a week ago by Hezbollah, a Lebanon-based pro-Iranian militia, which Germany, the US and several Sunni Arab states have classified as a terrorist organization.

The drone strike, if genuine, would mark propaganda victory for Hezbollah and reveal a significant vulnerability in Israel’s military capabilities.