2nd IS in ISIS stands for 'Iraq and Syria'. No wonder they are focusing on Iraq and Syria only at this time. Once they control Iraq and Syria, things will be different.
ISIS is cancer. They will spread to other areas eventually.
The ISIS is active in a large number of other nations, such as Libya, Yemen, Nigeria, Cameroon, and Afghanistan in addition to Syria and Iraq. But as of now, they have refrained themselves from attacking Turkey, KSA, and Israel.
Thats strange they are not attacking israel. Seems Israel and jews are natural enemies for radical muslims. Well israel is strong for them now, but they definetely will try to destroy Israel after syria and iraq. So Israel should take care.
They are not attacking Israel, because they receive tacit support from Israel. Israel want to replace the Assad regime in Syria at any cost. They have attacked the Syrian army positions inside Syria, which in turn helped the ISIS to advance.