Today, PayPal refused to accept payment from my MasterCard from VTB24. As it turned out, not only me and not only today. Recently, the VTB24 payment system requires the transfer of a CVC (CVV) code for each transaction, which, of course, was not reported to anyone beforehand. I do not know when PayPal will reconfigure its system for these changes and I doubt that it will reconfigure it at all. This is such security at the expense of the convenience of their own clients.
PS I wonder if there is any information about which payment systems transmit this very CVC code and work with VTB24? Bank employees could not name them.