Say, a Russian dissident went a western country, became a citizen, gave up Russian citizenship, then putin visits, this person gets mad, brings a gun and shoots putin.
What will international relations look like? Since the person is not exactly a native of their adopted country. Lets assume trump wasn’t president, what if its a Russian-American? Would the US extradite, or do the trial themselves. Would the headline look like “American Assassinated Putin” or “Russian Dissident Assassinated Putin”. Would it cause more or less tensions, than it it had been a non-russian white person being the assassin?
What about like EU countries? Australia? UK?
Or if the visit was in, say, Japan?
Why would they extradite that person? The murder took place in country A and the leader of country B got killed. That’s a problem for the courts in country A.
Some countries have a legal proviso that can activate their court system for crimes that didn’t happen within their jurisdiction. Some Syrian torturers that ended up fleeing Syria too found themselves in courtrooms in the EU. So if the perpetrator was able to kill leader of B in A but then fled the country, if B somehow got ahold of them, they could prosecute their leader’s murder on their own turf. That’s assuming they wouldn’t just send a hit squad.
All the headlines would just say things along the lines of “B-born naturalized citizen of A killed B leader.” I think it’s similar to all the al qaeda or IS terrorists who often held passports of the countries they terrorized.
The relations between these countries would obviously be strained. But how strained would depend on more factors. Where did security break down, who fucked up, and how did everyone react to this assassination? If B was indeed Russia and the shooter was Russian-born, you can bet they will come up with a media narrative how the culprit was long sought for gulag internment for their wild ideas but managed to flee from the glorious motherland. And then duped the hapless people of A to give them citizenship, the stupid, naive fools! If only they had listened to us, who are always right, before! Then this tragedy could have been averted.