The war is not going to remain forever and therefore, binance would never want to block the russians citizen from using their trading portal.
Russians can still trade crypto on decentralized platforms but binance would only lose their business if they ban the russia from using their site.
So far, the binance will not block anything, but you should not exclude such a possibility. Don't hold large sums on centralized exchanges, because it is always a risk, even without the threat of blocking. In the meantime, binance has stated that there will be no blocking and users from Russia, they can continue to use the services of the exchange.