"Russia threatens to stop supplying gas if not paid in roubles"

Let them. There are short term, midterm and long term solutions that we should have done ages ago. Let's use this blackmail to actually go ahead and achieve energy independence (from some other countries as well) and save the environment at the same time. It'll cost money, damage the economy, but that's both the price to pay for taking a moral stance to not finance a war, and the cost of acting too late to get our energy consumption in order. It's not as if we didn't know this already.