Who knows if they will actually collapse. Putin is crazy rich. He might actually be the richest person on the planet. Unlike Elon or Bill Gates he is private with his wealth. He doesn’t show it off. However he has tons of money and so do all the rich Russian people near him.
If the banks are in trouble he can easily bail them out. Or they can be bailed out with money from his friends. So this is why I don’t think they will necessarily go default. Lots of fake news out there. Don’t believe everything that you hear.
Russian banks are really close to collapse and we already saw yesterday how much the ruble and shares of banks and other leading companies in Russia fell. Russia's central bank is also limited in bailing out its banks, as some 70 percent of its $640 billion in reserves were held in foreign banks and are now frozen. In the future, they can go to compensate for losses to Ukraine from aggression against it.
Putin's wealth is a secret to Russians, but not to the banks and governments of the states where Putin keeps them. Now sanctions are also being introduced against Putin and his entourage. Therefore, the Putin regime will also lose most of its wealth from sanctions.
No, with such a continuing policy of aggression, no one will save Russia's economy. Putin tried to bring Russia to the brink of destruction. This is his choice and the choice of the people of Russia.