As I understand it, the west is freezing Russian central bank holdings. Meaning Russians will be unable to hold dollars unless they have an unsanctioned account

As I understand it, the west is freezing Russian central bank holdings. Meaning Russians will be unable to hold dollars unless they have an unsanctioned account in a foreign bank or have it as cash. I doubt that there is much cash USD in Russian ATMs. The paper rubles that come out of an ATM is just that. Surely the central bank can print more if the preference between holding money in the form of bank notes rather than in a bank account changes.