To be kind, Ukraine 'stability' is a very recent development, the new part is a determination to defend.
Frankly, I doubt that anyone actually expected that the new photogenic, articulate and culturally flexible Ukrainian government could do anything even close to what they are doing.
As for the fracturing, that is what gave the world Putin too. Frankly much of the world is finding aggressive populism attractive. We should be very cautious about our hopes; the world is not at all healthy now.
Germany, France, US, Brazil and many smaller countries are flirting with extremist populist control. China, too, has found a global foundation which they never have had before.
How much separatist sentiment is laudable? How much is deplorable?
Even in the present crisis most of the world's countries are essentially abstaining. The EU and NATO are almost all enthusiastic, but rather a consequential part of both are reluctant snd close neighbors are quite ambiguous.
I wish this were not true. When we look closely the cracks in the US, Germany, France, Italy etc appear. When we look at details cracks in basic support for democratic norms have not only appeared but are growing rapidly.
Hopefully Ukraine can help the world move towards a more positive direction. Hopefully...
The Ukrainians have probably been strongly encouraged to clean up their act to tell the world that they aren't Russian and to make the contrast as clear as possible. The war has done nothing but supercharged that image.
The war may deal a serious blow the the nationalist movements around the world too. We know that Russia fueled those movements in the UK and in the US via online media and other manipulation. They manipulated other countries too.
All these countries have genuine nationalists who have been there a long time. You can find evidence of white nationalists and extreme groups like the American Nazi party around for decades, but they were fairly small and politically powerless. The US also has had a small extreme left communist or communist leaning people too.
Back in the late 1980s when I worked at Boeing and they had a particularly bad battle between one of the unions and management a flyer from the Seattle Workers Party was floating around. I suspect it was a handful of people cranking these out at Kinkos, but it existed.
The bulk of humans are pack animals though. They go with whatever their pack is doing and don't personally care all that much about various causes. Some humans are very independent thinkers and go their own way and quite a few like to think they are independent thinkers, but are really pack animals when push comes to shove. I've thought that might be why cats and dogs are the two most common pets humans have in most countries.
Dogs are a pack predator, just like humans. Dogs bond to humans as pack members. Cats are solo predators and they make up their own minds. They bond too, but as family rather than a pack. Humanity are dogs seeking to become cats. But that's just my crackpot conjecture.
Social media and the algorithms of social media are perfect to prey on the pack instincts of most humans. Through fake accounts that are crafted to express a certain set of opinions combined with advertising national bad actors can manipulate the pack members into thinking the pack thinks a certain way and it does end up thinking that way.
Even before we had computers authoritarians had some understanding of this. In Mao's Cultural Revolution they killed most of the educated people because that was a population more likely to think for themselves. In countries like Russia and China, the news is strictly controlled and pumps out whatever the government wants.
In countries with open medias like the US, there is a broad spectrum of news available, but to the delight of authoritarians, people tend to self select the news they consume and they can keep their followers in a controlled universe of only the news they want their people to see. The fact that other news is available makes it more difficult to these people to take and hold power. There are too many people outside the nationalist pack. (They may belong to a different pack, but they are beyond the authoritarian's direct control.)
Coming back around to the fallout from the war, if Russia becomes wrapped up in its internal struggles and Putin is gone, this might dramatically weaken the Russian influence machine, or eliminate it. As a move to try and get sanctions lifted a post Putin Russia might hand over their playbook on the influence operations to the US or some other countries with open societies and let their authorities shut down the operations outside of Russia.
The Chinese and North Koreans have been playing cyber games too and they might take up the influencing game from Russia, but I think they would struggle to be as good at it as Russia. Russia is a very different culture from western Europe, but their intelligence services have worked to manipulate Europeans and Americans for 100 years with only a few years quiet when Russia was struggling in the 1990s. They are a different culture, but they knew how to speak the language like a native. They have been blind to some things in western cultures but they have been very good at identifying the cultural fault lines and exploiting them.
North Korea would be hopeless at taking up this mantle. Culturally they are alien to everyone else on the planet at this point. Their learning curve would be massive. China has a better shot. They have been trying to understand the west and working with it for about 40 years now, but compared to the Russians their propaganda is tone deaf. One of their biggest causes has been to change western attitudes about Taiwan and make themselves out as the "good" China. They have succeeded a little with the latter, but have pretty much failed with the former. They have made more inroads in the developing world where they are introducing their own satellite TV services with Chinese TV shows and movies translated into the local languages.
Without Russian influences in western societies I think it's possible that the nationalism we have seen in a lot of countries will whiter and die back to where it was 30-40 years ago. We saw the beginning of this earlier this week when Macron beat LaPenn by a fairly good margin in France. That was more due to Putin tarnishing the nationalist brand than his influencers going quiet. With the influencing operation quiet we might see a bigger swing back to the center.
Democracies are healthiest when a wide range of views are out there, but the bulk of elected leaders are a mix of center-left and center-right. The center-left is still there in most democracies because Putin has not been as effective in radicalizing the left, but he has almost obliterated the center-right in a number of countries, turning them into extreme right nationalists.