I'm not saying it's easy but it's the only life philosophy I read about that makes sense to me.
What's more likely to be nuked, London or Tirana?
Only 7 "urban areas" have more than 1 M inhabitants. Of those, the first two have almost 25% of the country's total population [0].
Also, I'd expect the huge and sparsely populated Nordic countries to fit the bill, too.
[0] https://fr.wikipedia.org/wiki/Liste_des_aires_urbaines_de_Fr...
But frankly, I don't believe a nuclear war is imminent. In spite of what we see in the new, Putin's army is moving on steadily and occupying more and more areas he wanted to have. At some point Ukraine will lose access to the sea. Then Putin can say, OK, I agree to peace - but he will never give the occupied areas back. And good luck getting these cities back without killing your own people - this is a completely different situation than defending a city that hasn't been captured yet.
Nuclear war would be possible if NATO decided to intervene. But they are crystal clear they will not and nukes are the only reason. Everybody is sending a lot of help, but not a single soldier (even though some individuals want to go on their own - but that's a completely different story than a military intervention).
At some level I'm afraid I think to myself: well my existence is a tiny cosmological insignificance, I cannot control that it is going to end at some point, and there's a significant likelihood it'll end in considerable suffering or in a way I can't predict.
It's hard to maintain that train of thought in the face of fear and I have little self-assurance that I'd manage it in more severe circumstances, but it is part of the process I use to deal with intrusive dark thoughts.
Every day in Ukraine there are people walking out in front of heavy mobile armaments with a single, hand-made incendiary, or just to stand in the way and demand that men with guns leave.
And every one of those people is making this rationalisation, at some level.
Stoics seek out likeminded friends, as well, I think. In this most recent case, more or less an entire country of them.
I always viewed Stoicism as a kind of Spock-like attitude. You can think rationally about something and not give in to emotions.
In this context I view it as being able to think clearly about what to do or reflect on it, but not give in to fear, anger or other emotions.
I am now dealing with two sick elderly parents. There are many many moments where I feel like dispair, fatigue, guilt or any other negative feeling. When these bad feelings pop up I actively try to focus on any task that can help their situation - make a phone call to some doctor or care provider, call them and ask them how they are, read about latest treatments etc. If I find that at this particular moment there's nothing much I can do - I try to let it slide. It's not under my control so no point in worrying.
It works surprisingly well many times, but there is no complete cure to worrying. Worrying is human.