::I'm afraid the Ustaše were (after 1941) very much anti-Italian, and did not "assist" in any of the numerous Italian war crimes against Croats and Slovenes (for which no one ever answered in any court). The faction that did assist the Italians were the Serbian Chetniks (who were of course very much anti-Ustase). See MVAC. 

 ::So the view you're pushing is plain nonsense. Croats may or may not have been supportive of the Ustase (and in Dalmatia they were generally not), but no Croatian faction was in favor of Italian annexation or occupation, and no significant number of Croats (particularly in Dalmatia and Istria) supported it. Let alone assisted in Italian or Italian-sponsored (MVAC) terror campaigns. Show otherwise?