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This is the difference between “partitions” and “regions”. Partitions have fully separate IAM, DNS names, etc. This is how there are things like US Gov Cloud, the Chinese AWS cloud, and now the EU sovereign cloud

Yes, although unfortunately it’s not how AWS sold regions to customers. AWS folks consistently told customers that regions were independent and customers architected on that belief.

It was only when stuff started breaking that all this crap about “well actually stuff still relies on us-east-1” starts coming out.

Yes - they told me quite specifically that until they launch their their sovereign cloud, the mothership will be around.

Which are lies btw - Amazon has admitted the "EU sovereign cloud" is still susceptible to US government whims.

Then it will be eu-east-1 taking down the EU

gov, iso*, cn are also already separate (unless you need to mess with your bill, or certain kinds of support tickets)