On Saturday, Western allied nations announced new sanctions on Russia, including blocking banks from Swift, a key international system for carrying out financial transactions and restrictions against the Russian Central Bank.
The measures will prevent the bank from using its international reserves to support the Russian currency to undermine sanctions.
Sergei Aleksashenko, a former deputy chairman of the bank, says the latest moves spell big trouble for the future of the rouble.
"It means there is going to be a catastrophe on the Russian currency market on Monday," he told Reuters.
"I think they will stop trading and then the exchange rate will be fixed at an artificial level, just like in Soviet times."
