Okay, it has happened but not in the age of nuclear weapons and not with the likes of Russia & China in light of that.
Germany and Japan
was in the age of nuclear weapons, but I get your meaning.
Our occupation of West Germany bordered Soviet controlled East Germany, so we were able to do this in a very 'tactical' manner with zero overflow into East Germany. We occupied that whole country until we were satisfied that the Germans had been 'cured' of their immoral ideology. We did the same in Japan. We 'looked over their shoulder' and 'held their hands' until they demonstrated that they could 'take the keys to the car', and again, it was an ideology that we had to 'stamp out' with our occupation. It worked in both cases, by all accounts. Both the German and the Japanese people----their whole polity, or nation----were turned from ideological wickedness successfully.
Sure, Germany, under the Nazi regime was a completely different country than it is presently and the same with Japan. Obviously that's something to be thankful for along with an overall progression away from many things decades past that were prevalent, including racial segregation.
The American South was undergoing a similar occupation until 1877, and then partisan politics got in the way of concluding that otherwise apparently successful endeavor. When that occupation was prematurely aborted, all the still existing Southern racists got legislative power and passed racist laws; laws that weren't truly expunged from America until MLK's crusade in the 1960s Civil Rights movement.
And even still, the very real racism remains. We are still dealing with the aftershock living in the wake of that fateful withdrawal.
The point is, you can change a whole polity's ideology, and in a very precise manner as regards national borders. And, it takes time, and, you have to 'see it through'.
Minority fringe elements are a problem in as much as any of them ever getting control which on an optimistic note is far from likely.
You all think President Trump was a member of a minority fringe element. What happened that was so bad? Last I checked he actively attempted to broker a peace treaty of some sort with North Korea, and Putin didn't invade Ukraine on his watch.
I'm no President Trump apologist, but I do give the Devil his due. It's only fair.
But the point here is that our Constitution survived even President Trump, and not only that, the world didn't suffer either. Our Constitution remains just as robust as it was before President Trump, and if anything it's actually stronger, because the Trump Administration forced America to take a closer look at a lot of how things are done in this country.
Even if Putin was the POTUS, even still, the world would be in no danger. It is because our Constitution supports a regime that is legendary, and it ought to be expanded now.
I hope WWIII never comes about. Still, isn't there a bit in the bible where it describes destruction to the extent of not a stone standing upon a stone? What happens with a blast wave from a nuclear bomb?
Jerusalem's Temple was destroyed exactly as Christ predicted that it would, and within the timeframe He provided. One generation is 40 years, as defined in Exodus when the Israelites wandered for one generation or 40 years. Christ's ministry occurred about AD 30. Temple was destroyed AD 70.
Nukes make craters. Where there was a city, now there's a crater. Russian nukes make slightly bigger craters than US and UK and French nukes, but they all make craters just the same.
One problem that we Americans who support the Second Amendment right to keep and bear arms perceive in the world today, is how the whole world seemingly points their fingers at us mockingly wondering when we'll 'get with the program' and make gun control much, much tighter. It's because of the suicidal and murderous people who get their hands on a bunch of guns and then take many innocent people with them as they die in a hail of police bullets, making them like the Kamikaze in WWII Japan. They are voluntarily dying and trying to kill as many other people as possible in the process.
We who support the right to keep and bear arms wonder when all the rest of you are going to figure out that you're all doing what you accuse us of doing, except writ extremely large. You're just basically hoping that some maniac doesn't get hold of a nuke. We can do something about that, and it does involve forming a new world government, or of extending an already existing government to engulf the whole world. I opt for the latter, and my vote is the United States Constitution be that one world government.
Cheers. And peace.