Putin has threatened so called unfriendly states to pay in rubles or have its gas supply shut off. It has said it doesn't buy things for free and so isn't going to charitable with its energy.
Europe has kicked against this with Germany saying its being blackmailed by this move. What other choice does Europe has with Russia alone selling about 40% of energy to the world.
When we learned this news, everyone said that none of the countries would pay in rubles for gas. What do we see today? European countries depend on Russian gas and if they do not want to freeze, they will pay in the currency that Russia chooses. Good Russia or bad, but it has gas, but Europe has no gas. We can talk a lot about this, but there is only one result - change money and buy gas.