However , these battalions were legal parts of various Ukrainian security agencies , most of them serving under the Ministry of Defense or the Ministry of Interior .
After the start of Russia 's hostilities towards Ukraine , many volunteers formed their own groups as territorial defense battalions .
These battalions were legal parts of various Ukraine security agencies , most of them serving under the Ministry of Defense or the Ministry of Interior .
After the start of Russia 's hostilities towards Ukraine , many volunteers formed their own groups as territorial defense battalions .