Territorial defence

Territorial defense is a group of people who will protect the civilian population on the ground, not directly in the war zone. It's in short. And a lot has been said about this lately because the formation of brigades and battalions of the Territorial Defence Forces of the Armed Forces of Ukraine is underway [Rubryka].
The Territorial Defence Forces fall under the command and management of the Armed Forces Commander-in-Chief. The position of the Territorial Defence Forces’ commander has been elevated to the level of the commanders of the branches of the armed forces. The commander of the Territorial Defence Forces has the same status as the commander of the Air Assault Forces or the Special Operations Forces, for example, having headquarters.
Given that Ukraine has 26 administrative division units, with each supposed to form its territorial defense brigade, it would be difficult and perhaps ineffective to manage such a network from one headquarters. Therefore, each military administrative zone’s operational command established a regional headquarters for its territorial defense forces. The Territorial Defence Forces now have four regional headquarters: Northern, Eastern, Southern, and Western commands [ICDS].

Sources:

Territory defence: how to enter and do you need to go through a health check? Rubryka. Retrieved from: https://rubryka.com/en/article/teroborona/

Ukraine’s Territorial Defence on a War Footing. ICDS. Retrieved from: https://icds.ee/en/ukraines-territorial-defence-on-a-war-footing/