MiGs were purchased by former Yugoslavia, Bulgaria, Hungary, Romania, Czechoslovakia, Poland from USSR.
Belarus still has 10 L-39 planes manufactured in Czechoslovakia. These are jet training planes. But spare parts and services were purchased from Russia in the last 25 years. In all honesty I don’t think there’s much wrong in purchasing weapons from Russia. The entire world is using Russian made weapons even these countries are not Russian allies.
It comes to whether a country has its own planes or it does not have them at all.