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your not thinking big enough, firstly, if kadyrov wants to take out prigozhin or lukashenko, he doesn't need that nuke to necessarily be a projectile. a truck might just do the trick 
secondly proliferation becomes a major concern. who's to say these fuckwits wouldn't SELL a nuke to some random african warlord. all of a sudden you have boko haram detonating dirty bombs in mogudishu or somewhere in the Sahel
Prigozhin's got his own private army, Kadyrov's got one, Shoigu's got one, there's tons of less known private armies, and now we're throwing Gazprom into the mix. 
It's going to be insane when Putin finally needs to get replaced. >

yeah, this is terrifying to be honest. if russia falls into a period of warlords chopping up the country. Russias nukes would fall into their hands, thats very very bad for the rest of the world. >

Meh. The ability to use them as projectile weapons is likely centralized. Same reason Ukraine gave up theirs after the USSR fell. Couldn't use em alone. Couldn't maintain em alone. The nuclear material though....eesh.