Ideally, they will come out with a statement of their own. When the Reserve Bank of India introduced new rules regarding recurring transactions that all banks and payment processors had to comply with, Stripe put out a page on the topic.[1][2]
All this has happened before.[1] I guess the safest alternative is to screen customers from Belarus, Ukraine and Russia till the situation becomes clear.
"Never turn away a paying customer."
If Stripe (and others) can't cut it, go to somewhere who can. If that means using a Japanese/Nigerian/Swiss/Singapore/Brasilian/other bank, so be it.