As those exchanges shutdown their services in those countries, citizens of those countries will definitely find alternatives. To be sincere with us what happened will create opportunities for other exchanges. There's no vacuum in life.
It's quite easily to find alternatives from many available cryptocurrency exchanges but things happen in Russia and Belarus are very complicated and dangerous for citizens in those nations. There are regulatory and legal barriers on exchanges and citizens, so if people there are not carefully obeying regulations there, they will have legal problems with governments by using unlicensed exchanges.
My country once had that experience of exchanges shutting its services during President Buhari era when it was alleged that certain exchanges weren't complying with regulations and taxes. It affected Binance, OKX and Kucoin. And they stopped P2P for Nigerians. In fact, OKX and Kucoin completely shutdown their services. My compatriots had to look for alternatives and that was how we discovered Bybit and Bitget. I believe that also grew the subscriber base of those new exchanges.
People can move around and find alternative exchanges to use but they still have legal risk with regulations in their countries. Global exchanges can allow people in such nations to use their platforms but legal problems will be on user side. You can use global exchanges, have P2P trades with other trade partners but you will never be sure that money flow in and out your account will not be traced and known by government and tax authority. They might knock you down with bank account freeze, money freeze and legal case against you.
