If they think that throwing a punch is likely, they stay out of range. you’ll notice that in both the Aus and British parliaments, where there is strong gang membership, the two sides are separated by a table that is wide enough so that then can’t hit across with a sword. That’s why you don’t see the gang brawls that you sometimes see in other countries. The Korean border has a similar table, for similar reasons.
I don’t know if the American security would brawl if a punch was thrown, but I don’t expect the British, Aus, or Israeli security would brawl. They’re too professional. That is, they don’t really care. They aren’t there to stop the politicians punching each other, and they might actually find it amusing.
The US Secret Service is most certainly there to keep the President from being the victim of violence, and so if fighting were initiated by either side, my expectation would be that they would interpose themselves and physically hustle the President out of the room.
Man, how awesome would it be if both Kim and Trump each secretly brought a knife into a summit meeting? And after they both draw, they agree to one of those “Beat It” fights where their forearms are tied together?
If the OP has been answered well enough, I had a related question: to what degree would the guards of one nation’s leader fend off another nation’s leader from attacking theirs?
Imagine two high-ranking leaders who really hate each other and have had a terrible back and forth argument who start getting edgy and do a bit of shoving or throw water in each other’s faces. It might sound far-fetched but politicians do mix it up now and then.
I’m pretty sure the guards aren’t going to pull out guns and start shooting but wouldn’t it be pretty sticky for guards to start putting their hands on a different nations leader and shoving him around to get him to back off? There must be some sort of protocol in place for guards getting physical with high ranking people who’ve brought guards of their own…
What would be so bad about that? Think about this: Suppose leaders at war with each other had to physically fistfight each other instead of sending their armies to fight against each other. Voila; instant world peace.
Watch a bench-clearing brawl in baseball or football. There may be a punch or two thrown by these guys, but for the most part, they’re more level-headed than the guy who was just hit by a pitch or tackled late, they tend to square up & separate the combatants rather than escalate the scrum. I assume professional security personal who’s job it is to physically defend someone would do this more than an athlete.
Throwing water in someone’s face is aggressive & humiliating but hardly life threatening. Even throwing a punch typically does not any more than some pain or maybe a broken jaw; yes, occasionally someone has died from a single punch, but that’s the exception rather than the norm. I’m not sure use of force protocols allow them to break out guns rather than isolating & removing their charge.