Ukrainian Volunteer Army

The Ukrainian Volunteer Army (Українська добровольча армія, УДА) is a volunteer military formation established in December 2015 by Dmytro Yarosh after his departure from Right Sector. On October 14, 2018, Yarosh announced that all combat units were leaving the front line and the main focus of the Volunteer Army would be the construction of territorial defense units.

As of 2022, the units are part of the Ukrainian Territorial Defense Forces, and they also maintain partisan units behind the enemy lines.

Formation
Following the outbreak of the Russo-Ukrainian War, the right-wing Ukrainian nationalist party Right Sector, which was known for its involvement in the Euromaidan, established the Ukrainian Volunteer Corps in response to the rise of pro-Russian separatist forces in the Donbas. The formation was led by the Right Sector's founder and leader, Dmytro Yarosh.

In November 11, 2015, Yarosh announced that they would be leaving the leadership of the Right Sector. In December of the same year, Yarosh announced the creation of a new military formation, the Ukrainian Volunteer Army, using some of the units of the Volunteer Ukrainian Corps as a basis, including the 5th and 8th Battalions and the Hospitallers. Although the Ukrainian Volunteer Army was an independent military formation, it cooperated with the Ukrainian Armed Forces.

Combat history
In February 2016, the 5th UDA Battalion, along with the Ukrainian Ground Forces' 74th Reconnaissance Battalion, fought in the Battle of Avdiivka, where they took positions in the Avdiiv industrial zone and fought for control of a part of the Donetsk-Horlivka highway in the area of the Yasynuvata junction. Later in June 2016, the UDA's 8th Battalion was deployed to Shyrokyne to perform reconnaissance operations against local separatist forces.

On October 14, 2018, Dmytro Yarosh, the commander of the UDA, announced that the 5th and 8th separate battalions of the Ukrainian Volunteer Army would be leaving the front line. However, he emphasized that the UDA was not leaving the war and would continue to participate in it as long as it continued. He stated that the most important task for the UDA at that time was the construction of territorial defense units with clear functionality.

Russian invasion of 2022
The UDA was restructured and expanded, consisting of six battalions, a medical battalion, three support battalions, and a center for coordinating partisan operations. For several months, the majority of UDA units were stationed in the southern region of Ukraine and were involved in the Southern Ukraine campaign. Along with regular forces, the UDA also worked alongside partisans in the counteroffensive in Kherson. The UDA became part of the Territorial Defense Forces.

On June 7th they participated in the Battle of Neskuchne alongside the 129th Territorial Defense Brigade. By June 11th they announced the they had successfully stormed and liberated the village.

On June 27th they announced, along with the 37th Marine Brigade, that they had liberated the town of Staromaiorske in the Donetsk region.

Ideology
In 2021 political scientist Huseyn Aliyev described the UDA as holding a "generic form" of Ukrainian nationalism, which allowed the inclusion of ethnic minorities, including Muslim Crimean Tatars and Chechens, and ethnic Jews, Poles, Hungarians, Greeks, and Romani.

Structure
As of 2023, the army's structure is as follows: