No, it's not just oil on which Putin's economy rests quite well, and this allows the Orthodox Rashist Caliphate not only to continue, but also to intensify the War against Ukraine...
Alas, there are no sanctions from the EU on Russian non-ferrous metals (aluminum, nickel, copper, etc.), on liquefied gas, on nuclear fuel.
And this is at least another 30 billion dollars a year for the Russian military budget.
Plus the greatly increased supplies of Russian pipeline gas to the EU.