I've noticed it back some ten years ago, and, apparently, it's still the case today -- most online retailers in the US directly procure the information about your credit card, whereas in Russia, credit cards are mostly processed exclusively by third-party centralised payment systems (say, like Yandex.Checkout, which is actually itself a new system that's been replacing some of the older local processor-only shops).
This happens even if the retailer in question is a very established hosting provider (owns their own datacentre or two), or an ICANN-Accredited Registrar, e.g., businesses I'd actually trust (before you get to it: not just for the above reasons), compared to some random shop or periodical subscription in the US.
