BEIRUT – Israel conducted a rare airstrike on a military target inside Syria near the border with Lebanon, foreign officials and Syrian state TV said Wednesday, amid fears President Bashar Assad’s regime could provide powerful weapons to the Islamic militant group Hezbollah.

Regional security officials said Israel had been planning in the days leading up to the airstrike to hit a shipment of weapons bound for Hezbollah, Lebanon’s most powerful military force and a sworn enemy of the Jewish state. Among Israeli officials’ chief fears is that Assad will pass chemical weapons or sophisticated anti-aircraft missiles to Hezbollah – something that could change the balance of power in the region and greatly hinder Israel’s ability to conduct air sorties in Lebanon.

The regional officials said the shipment Israel was planning to strike included Russian-made SA-17 anti-aircraft missiles, which would be strategically “game-changing” in the hands of Hezbollah by enabling the group to carry out fiercer attacks on Israel and shoot down Israeli jets, helicopters and surveillance drones.