3 platforms stooped trading the pair, the rest, including IB lowered margin from 10 to 7.5

Due to extremely illiquid market conditions trading for all RUB currency pairs* has been temporarily placed into 'Close Only' mode, which means that:

you can maintain your current open positions; you cannot open new positions; pending orders for opening new positions will be rejected. We kindly apologize for any inconvenience this may have caused.

пишут что и другие брокеры ограничивают или прекращают по какой-то причине