That case possibly looks like obeying sanctions, although they have failed to explain why they think this customer is in Crimea. For example, OVH may have disco

That case possibly looks like obeying sanctions, although they have failed to explain why they think this customer is in Crimea. For example, OVH may have discovered that the Russian ISP involved was putting fake data into geoip, and if you're aware you can't just pretend you don't know. BTW, if it was just "we don't want to do business with you any more", that depends on what your contract says. Most consumer ISP contracts allow an ISP to drop a customer for any reason without explanation.