It would guarantee future for Russia. Right now 50% of Russian budged is from carbohydrates. Due to fracking and decarbonisation it won't be profitable to mine in Russia in 15 years[1]. Without that income, states like Chechnya, are gonna try to leave the federation.
It's good for China as well, since USA sanctions would not be that effective.
The Atlantic world doesn't want the 3rd power (hence USA and UK are helping a lot in Ukraine) as well as Central European countries (Poland, Ukraine, Baltic states etc.) The table that shows military aid by GDP is an eye opener.
[1] Gas and oil from Ukrainian shores (Crimea) could speed it up.