Yes but Arabs are not anywhere near all ISIS
No ISIS is not just Arabs
Many or most of the ISIS fighting in Syria are foreign jihadists, many non Arab (Chechen, Uighur Chinese, whatever Islamic radicals come in many nationalities, including white europeans)- so much for it being a “civil war” against Assad
ISIS leader al-Baghdadi (Iraqi, supposedly) put out a worldwide call for jihad and the rats came running to Iraq and Syria
Part of the reason Russia moved in against “ISIS” was to stomp this vipers nest before it could draw combatants who would then migrate to the former Republics and into Russia