The lower-intensity fighting in Donbas has reduced the Ukrainian military's reliance on volunteer battalions. These units, which hold strongly nationalist and at times far-right ideologies, served on the front lines during the war in the east. Some of the groups are financed by oligarchs: For example, former Dnipropetrovsk governor Igor Kolomoisky reportedly spent at least $10 million on funding the Dnipro 1 battalion. Ukrainian authorities have repeatedly tried to integrate these battalions into the regular military structure, with mixed success. The volunteer formations include thousands of armed fighters who are seasoned in combat, raising concerns that the battalions could eventually present a security challenge for Ukrainian authorities. Moreover, there are reports that some battalions committed human rights abuses and are increasingly involved in criminal activity in the east, further galvanizing Kiev in its attempts to manage and restrain the groups.