Comrade, I will quote Lermontov. "Horses and people mingled in a heap."
The troops of the Internal Troops of the USSR Ministry of Internal Affairs were sent to various "hot" spots after the emergence of interethnic conflicts in the late 1980s. They did not consist of national elements, did not occupy the parties to the conflict, they maintained law and order. They set up checkpoints, guarded trains, schools, theaters. Mobile detachments of the Internal Troops on armored vehicles (I hear about tanks from them for the first time) were involved in suppressing riots, destroying bandits.
Often the Internal Troops acted together with the ordinary militia. The Soviet militia (namely the militia, not the Internal Troops) was engaged only in the protection of law and order on ordinary days. They had almost no equipment, as well as heavy weapons.
After the collapse of the USSR and the withdrawal of the republics, units of the Internal Troops were withdrawn from hot spots. They were taken out of the Baltic states, from Sumgait, from Karabakh, from Andijan. The soldiers of the internal troops were conscripts from various regions and were not interested in participating in the conflict voluntarily, they were returned to Russia.
There was a mess in the country then, and I can assume that local authorities (Georgian and Abkhazian) could illegally buy weapons from leaving troops, and also invite some officers. But the regular units did not participate in this. In any case, I have not heard about it.