My god, I had completely forgotten this stuff - I am so aged that I studied Soviet politics when the USSR still existed and - honestly! - I used to know slogans like 'national in form, socialist in content' but they have sunk to the depths, you are not going to learn much from me now. The 'NIF,SIC' era was what I was talking about when I spoke of the relatively benign period for the minority nationalities in the first period of the USSR, although my memory is tat it didn't last that long? It could be argued as quite a pragmatic solution to the problem of keeping the peripheral nationalities on board when the new Moscow regime was still fairly weak and didn't have the ability to just impose its will - and of course there was a genuine desire to replace Czarist Russian Imperialism with something more consensual, if the USSR was going to work then it couldn't just be the Russian Empire in disguise. But Stalin was pretty early on attacking nationalism, and I remember he replaced the (latinised) Tartar alphabet with a cyrillic one, and various of the -istans CPs had purges based on their "bourgeois nationalist" behaviours during the 30s. I thought Russianisation was only suspended briefly in reality whatever the theory was. In a sense, Stalin was able to get away with it because he wasn't a Russian, so it was quite hard to accuse him of "Russian Chauvinism".