ISIS and Israel

There is a strange relationship between Israel and a small sect of the Islamic State of Iraq and Syria (ISIS) based next to the Golan Heights. The very presence of a group like ISIS so close to Israel poses many questions.  Firstly why has ISIS not attacked Israel – a country they have sworn to destroy – from said base? Similarly why has the Israeli Defence Force (IDF) not attacked this small and weak group of extremists on their border? The answers to such questions show the truth behind the rhetoric all actors use in this conflict...Israel is focused not on ISIS and Sunni groups, but on the Shia groups in Syria. Israel's airstrikes have hit Assad’s Shia-backed regime and Hezbollah, not ISIS or al-Nusra. Correspondence between the then-Secretary of State Hillary Clinton and political advisor Jacob Sullivan about Israel’s aims in the region tried to rationalise why Israel ignores ISIS." (thanks Helena)