The Golan Heights, one of Israel’s quietest frontiers, is showing signs of becoming an active front that could soon bring the forces of arch-enemies Iran and Israel into direct contact for the first time.

For nearly a month, Lebanon’s militant Hezbollah organization and other Shiite forces under Iranian command have been inching their way across a belt of southern Syria in a bid to drive out rebel forces fighting the regime of Syrian President Bashar al-Assad, an important Iranian ally.

If the offensive is successful, it could leave Iranian forces and their Shiite allies in control of the Syrian side of the Golan. And from that vantage point, Tehran could gain an additional means of deterrence against Israel in the remaining months before the June 30 deadline for negotiations over Iran’s nuclear program. […]