Other European countries, other western countries like Canada, Australia, or New Zealand

I live pretty much in the middle of nowhere that is between three mountains and a Scandinavian fjord. I don't see any safer alternatives to where I'm already at.

Australia, New Zealand, and Canada would probably be a popular choices.

Europeans would (will?) flee westward, away from Russian aggression.

Even if most of Europe is party to war, there will still be a front line and limited deep strikes. You don’t just have continent wide war with no place to flee to.

If Russia starts dropping nukes then it won’t be a Europe-problem anyways….

Since people from war-torn nations often flee to Europe where they tend to get all kinds of help and support

They don't do that at all. That's a deceitful right-wing talking point meant to create xenophobic reactions.

People from war torn nations move to non-war torn parts of their own county, or their direct neighbors. Only a tiny fraction go further, and only a fraction of those go all the way to Europe.

we will colonise the arctic and make New Skyrim

They flee to Switzerland aka Supereurope. After that you pray to the heavens.

Australia. Happened all the time

Historically, Argentina and the USA.

Well, anyone who could flee my country already has, so probably nowhere.

(Random thoughts, I'm clueless about this subject, it's safer to assume I'm wrong about everything)

USA is an obvious first choice for many. I imagine other developed countries in the Americas will be hotspots too. The big question is which countries would accept mass influxes of European refugees.

I wonder if enough could flee to Africa, and bring some substantial wealth with them... Would that actually help Africa catch up to the developed world? Or would it instead just be new colonialism?

Of course Africa is huge, diverse and messy, so that's a very vague answer/question.

We'll go to China, of course!

South Africa, because I can.

The question implies war in Europe. The reality is that once the enemy breaks though Poland and Czechia (and even there I wouldn't put much credence into the latter), the rest of continental Europe will fold without a war. People will not flee, but gradually adjust to the new overlords. There may be small migration of the intelligentsia, which is in danger from any oppressive regime, but that will be likely in form of orderly emigration, rather than flight.