US treasury department regulations prohibit US companies from working with people and companies in Russian-controlled parts of Ukraine. Unfortunately, IP geolocation is accurate only to the country level, so US companies have no choice but to block the entire country to comply with regs.

This is the first case I know of. I never get such issues here in central Ukraine. This is because occupied regions always present themselves as Russia, not Ukraine. If something says that it is Ukraine, it's a sure sign that it is NOT occupied by Rissua.