A slightly different angle -
One thing is certain is that this truly was due to a financial disagreement - the ufc creep kept saying 'I owe you what?' I suppose it doesn't make much sense calling him ufc creep given that he fought in the ufc only once 2 years ago (he hasn't fought since) - and the rest of his fights were in m1.
I will say this - yeah, it was a sucker punch, but at least it was one on one - and Kharitonov is the bigger guy. So, yeah - despicable and if he also had a weapon, he should be locked up. Then again, apparently his daddy is loaded, so I doubt much will come off of this - at least in the legal system.
As many may recall, Khabib Mcgreggor fiasco started because Khabib had a face-off with another russian dude - only in that case, the russian dude was by himself, while khabib brought his whole crew, which was despicable and idiotic at best, which is why i don't get the whole worship of khabib - as a person, he's a creep.