Khabib Nurmagomedov rubbed elbows with another powerful political figure Thursday night -- Chechen leader Ramzan Kadyrov ... a man who's been accused of some pretty horrible stuff.
The two hung out at a Russian MMA gym -- described as a fight club -- where they posed for pics, ate some food and celebrated Khabib's victory over Conor McGregor at UFC 229.
"The way I am grateful to your support in words not to describe and praise to god who made us all brothers through our religion.