Thinking about it more I would expect the opposite.
I.e. there would be an imbalance of people wanting to sell Rubles to buy USDT/BTC/Eth etc... as a currency hedge/escape route.

But this discount is implying the opposite...

Arh - so does it imply that exporters are using Binance to convert USD->RUB as I am assuming this just became hard. So happy to pay 10% to do this?