The Ukrainian NGO “Security and Cooperation in Ukraine” has released a 225-page report titled Armed Aggression of the Russian Federation Against Ukraine, which offers the fullest-to-date compilation of the participation of the Russian army, irregulars, and paramilitaries in hostilities in Ukraine's Donetsk and Luhansk oblasts during their hottest period, from March 2014 to February 2015.
The report provides a legal assessment of the Russian aggression against Ukraine and outlines the organizational structure of the Russian military invasion force that had been involved in the fighting against Ukraine since March 2014. The force, the study shows, comprised regular and irregular units of the Russian Army, Don Cossack formations, and private military contractors.

”The materials of this report were presented in the first lawsuit of Ukraine against the Russian Federation, which was filed by the Ministry of Justice of Ukraine to the ECtHR, as they prove that contrary to the official position of the Russian Federation and Russian propaganda, there was no internal conflict in eastern Ukraine in March 2014, and there was a continuation of the armed aggression of the Russian Federation, which continues to this day,” according to the NGO.
Finds
The data consolidated and systematized in the report shows that right after the annexation of Crimea in February 2014, the Russian Federation continued its armed aggression against Ukraine by using regular and irregular formations of its armed forces in eastern Ukraine. From March 2014 to February 2015, they managed to establish control and occupy certain areas of Donetsk and Luhansk Oblasts.According to the report, during this period, detachments of 52 military units of various branches of the regular troops of the Armed Forces of the Russian Federation from its Southern, Central, Western, and Eastern military districts were deployed on the eastern borders of Ukraine and in the territories of Donetsk and Luhansk Oblasts.
From 2014 to 2015, Russia formed 53 tactical groups (39 battalions and 14 companies) numbering 50,500 militaries out of those regular army units, the report found. Additionally, a military reserve was created, it consisted of 21 tactical groups of Russia’s Armed Forces (15 battalions and 6 companies) numbering 9,000 people. During 2014-2015, the number of the Russian military contingent in eastern Ukraine increased to 80,000.
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Russia also engaged paramilitary formations of the Russian Don Cossacks in its aggression against Ukraine. According to the findings of the report, the Cossack formations operated mainly in Luhansk Oblast. Another actor in the Russian aggression in the Donbas was the private military company (PMC) E.N.O.T. Corp. The PMC disguised its activities as providing humanitarian aid. However, among the tasks it performed in Ukraine’s occupied territory were delivering weapons and supplying irregular units of the Russian Armed Forces, protecting Russian-backed field commanders and the occupation administration leadership, liquidating field commanders of irregulars who showed signs of disobedience. The PMC also participated in hostilities directly.The Russian Army’s multiple irregular military formations it formed in the occupied Donbas were over 22,500 men strong in 2014-2015.

The full text of the report Armed Aggression of the Russian Federation Against Ukraine is available on the website of the NGO Security and Cooperation in Ukraine (only in Ukrainian at the time of this article's publication).
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