Nineteen months of fighting and the mounting chaos engulfing the regime of President Bashar Assad have already spilled across borders with Lebanon, Turkey, and Jordan. The danger of drawing in Israel as well to a wider regional conflagration is one of the worst-case-scenarios for the civil war.
Violence also flared Sunday on Syria's northern border with Turkey, a common flashpoint. Syrian army forces backed by helicopter gunships and artillery attacked a border area with Turkey after rebels captured a crossing point, activists said.
The Britain-based activist group Syrian Observatory for Human Rights said the Ras al-Ayn border area in Syria's northeast was "under siege" as dozens of rebels tried to hold onto the border crossing.
The upheaval has largely had no direct impact on Syria's bitter foe Israel, and their shared border has remained mostly quiet, as it has been since a 1974 cease-fire.
Still, Israel worries that Syria's civil war could spill across into the Golan – a concern made more immediate by multiple cases of errant fire in recent weeks and Israel's claim that three Syrian tanks entered the demilitarized zone on the plateau this month for the first time in 40 years.