That is bad news. Because the Chechens are the most effective fighting force within the ISIS. The recent setbacks suffered by the ISIS in Syria can be directly attributed to the death of high ranking Chechen commanders, such as Abu Omar al-Shishani. They have decades of experience fighting against the Russian army.
Of course because they are now part of ISIS they now then have the support of ISIS which also have a most of the support of the other tribe or terror group around the world so this one didnt shock me at all