There is no alternative to Russian gas for Europe, neither reasonable nor even unreasonable. And any statements to the contrary are cheap political populism in pursuit of pre-election popularity. "Pay for gas in rubles or die", it does not look like a difficult choice to think about for a long time.
What about electric heating or using pressed briquettes ? With financial support from government, private houses can change heating system. I am not an expert, but wont central heating be replaced with steam heating? I think it does not matter how to heat water in pipes, with gas or steam boiler. First years will be hard, but wont countries have some gas supply. And I think people can always buy gas from "Russia friendly countries" with the price cheaper than directly from Russia, but expensive then usually.
Today is April 11, 2022. In March, until April 1, the "leader of the greatest power" set an ultimatum - "whoever does not pay in rubles from April 1, the shipment of gas / oil will be stopped. I said so, I am the greatest ruler!" . Can someone tell without a smirk how the "greatest new Fuhrer" brought the whole world to its knees and how his ultimatum was implemented? And tell us what else do you think the "greatest ruler" will take in the next steps, who today brought the "greatest economy" to a financial default! 
I will answer you here because you made your topic about the Russian "default" self-moderated. The snn article you link to is bullshit and premature ejaculation. Russia has more than enough money to pay all its debts immediately and in full. But the West needs Russia to declare a technical default in order not only to freeze the $300 billion of the Russian Central Bank, but also to expropriate them. This is the most common theft and robbery, the West issued a "black mark" to itself and undermined confidence in the dollar and the euro (as well as in the Japanese yen, the British pound and even the Swiss franc). Further, in essence, the due date for the payment, which could not be met due to the freezing of funds, was April 5th. After that, there is a month of grace period until May 5th. After that, creditors can present for default, but a quorum must take place, which must still be collected, which is technically not easy to do. Further, if the quorum of creditors still meets, the rating agency must declare a technical default. It is not clear which rating agency will be able to do this, they all stopped working with Russia due to sanctions. Then there will be a trial, because Russia has payments in its hands confirming that it paid its obligations in good faith on time, but the bank did not process these payments due to sanctions. And only then will there be a real technical default, and Russia will lose access to the external borrowing market, which it has already lost due to sanctions.Let's have your next weekly package of sanctions, Russia puts them in a package with packages.
Thanks for the answer. To begin with, self-moderation is evil for you? Do you think I will delete objectionable posts? I'm willing to give my word that, theoretically, only posts that are offensive or violate forum rules can be removed. If you want - if suddenly it comes to deleting posts - I will collect them in one post for "conservation". In a word, do not be afraid - we have democracy and not Russian totalitarianism with total control of everyone and everything
Well, on topic:
"The snn article you link to is nonsense and premature ejaculation." - this is just YOUR thought, but also far from reality. Few people believe in fairy tales about the fact that "Russia is a great power" for a long time. This is a country of a terrorist - yes, this is a country of a criminal - yes, a country of a thief - yes. But not great
And she has as much money left as she has left. But at the same time, she has obligations, she has a need to wage a losing war in Ukraine, with huge losses and costs. And there is a desire to continue to violate the accepted international obligations, laws, agreements. Regarding the blocking of funds, these are sanctions in response to the annexation of a part of the territory of an independent country, as well as the unleashing of a terrorist war on the territory of Ukraine, by the way, the security of which was Russia itself. Sanctions do not contradict any norms and laws - if this is not the case, your arguments and references to the legislative framework. Moreover, you forgot one nuance - most of the blocked funds will be transferred to funds to compensate Ukraine for the damage caused by Russia as an aggressor.So I'm sure we will soon see a further collapse of the "strongest economy, the greatest power", which is actually an empty shell and whose statements are empty words