Who would win in a fist fight among world leaders?

Dxk007
Suppose, it's a battle royale among all the world's leaders, who would you think will be the last man standing.
Obviously, Vlandimir Putin, Barack Obama and Xi Jinping (China's current President) have advantage over other's, having a military background. But, they would probably be targeted among others.
So, who'll win? And why?
You can also include world leaders from the past.
Note:- No weapons allowed.
Who would win in a fist fight among world leaders??
Updates
+1 y
Yeah, in a one on one fight, Putin will demolish his opponents. He might take out around ten at once.
But, they are all politicians so, Putin is the prime target. And, since I allowed any world leader from history, there would be around 1000+leaders out there. And, Putin isn't a Hollywood superhero who will take out all 1000s of them.
So, after Trump, Putin will be the next to be removed from the competition. That's what politics is all about. United we stand, divided we fall.
Who would win in a fist fight among world leaders?
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