Data Residency requirements for Machine Learning

How does the AI community handle data residency requirements for training Machine Learning models when your customers are spread across the globe ?

Assuming legal framework is in place to use the data with strict data residency requirements.

What exactly do you mean by data residency requirements?

Hypothetical to explain.

Out of 100 customers, 20 are in EU, 20 are in UK, 20 are in India, 40 are in US.

The data of these customers are stored locally to comply with country specific data residency laws.

What is the best way to train ML models in this scenario ?

This is not a technical question. More focused on data compliance.

Thanks for the additional information.
Sorry, I don’t have any guidance on compliance issues.