I’ve seen the “Mad Max movies only show us what’s happening in Australia so wouldn’t it be funny if the rest of the world was fine?” take and the “Fallout only takes place in the US so the rest of the world is fine,” take. But what about “They are both happening simultaneously but every other part of the world is ignoring them.”
Or even, "every part of the world is having its own specific apocalypse and no one has the time or resources to give a crap about anyone else's"
The Metro series is whats happening in Russia.
V For Vendetta(comic) is going on in England.
Ratatouille is happening in France