Hi there.
Due to global sanctions on Russia and Belarus, CEX.IO, as a regulated entity, has implemented temporary measures. These include the suspension of deposits, withdrawals, and trading for accounts held by users residing in Russia and Belarus. I've observed that the support team has requested additional verification information from you, which you've provided. Your case is presently being reviewed by our compliance team, and I've escalated it for urgent attention. You can expect updates soon.
But OP has been living in Bulgaria and using your service there, not in Russia or Belarus.
Perhaps he is an overly rich oligarch who, as an individual, is under sanctions and on the blacklist.

that's why mentioning sanctions on Russia is not relevant. IMHO.
Of course, sanctions against Russia should not be the reason in your case. Maybe they can ban you from using the platform, but they must certainly allow you to withdraw your funds.