On Tuesday, the US military cautiously celebrated what has the potential, if confirmed, of being a major victory in the fight against ISIS.

A US airstrike on Tuesday was believed to have killed ISIS’s “minister of war” Abu Omar al-Shishani, also called Omar the Chechen.

If true, such a strike will both seriously hinder ISIS’s tactical abilities on the ground as well as the group’s ability to recruit foreign fighters from the Caucus regions.

Aside from ISIS’ ‘caliph’ Abu Bakr al-Baghdadi, the Georgian ex-commando Omar al-Shishani was the most recognizable and popular of the powerful militant group’s leaders.