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If someone wants to kill themselves there are a lot less complicated ways than trying to get a hold of a nuke.  Using a nuke means your rule is over.
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. >

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 >

Who is going to support a warlord that nukes their opposition?
NATO, the UN, etc., would not just say "Okay Kadyrov you're standing on the pile of radioactive ashes, I guess we'll recognize you."
There is a threat of a "rogue" nuke but they are watched fairly closely, require constant maintenance, and are not quite as easy to detonate as a movie might suggest.  That warlord now has the same problem, using it ensures your own defeat at the hands of the world. >

your presuming these are all rational actors here. 
now Shoigu, prigozin, sure they seem intelligent/rational.
but when i see Kadyrov, the words rational do not enter my head. Thankfully though, in the event of russia balkanizing, he'd be the least likely one to end up with his hands on some nukes.
Shoigu and whoever is leading this Gazprom military would probably get the lions share