Can that even be done? i'm talking about the part of prohibiting european gas companies from using roubles,
"Moscow is expected to make public its plans for rouble payments on Thursday, although it said it would not immediately demand that buyers pay for gas exports in the currency.
Russian President Vladimir Putin and German Chancellor Olaf Scholz have agreed in a call that experts from their countries would discuss how payment for Russian gas exports could be made in roubles, the TASS news agency reported."
Basically it seems like moscow is giving buyers some time to switch to roubles for their payments. And, atleast in germany, there will be discussion on how paying in bananas could be done.
I don't think personally that there will be a ban on paying gas with roubles simply because the eu (specially germany) has to get most of their gas from russia. it would be political suicide to pass something like that.
Also: "Russia's most senior lawmaker said on Wednesday Russia
could demand rouble payments also for other commodities including oil, grain, fertilisers, coal and metals, raising the risk of recession in Europe and the United States."
reuters