because that's already happening as western and some Asian businesses pull out of the country and unemploy tens of thousands in the process. That means less demand for what's left and that means more unemployment. It's a vicious cycle, one we've certainly seen here in the US time after time as idiot corporations think their way to prosperity is to fire the people who produce their goods and services. Even if Putin is out on his arse and the war ends tomorrow and a contrite Russia sends in rebuilding teams, this is going to happen because once it starts in a large enough economy is for government to spend its way out of it, and Russia can't do that. because defaulting on the vig means no one will lend them anything.
And no, China won't front them a single RMB, their own economy is hanging by a thread as real estate prices implode, and I'm afraid that's it for Russia's wealthy friends.
My sympathy is for the Russian people, even the ones who voted Putin in. They didn't know he was a weasel with delusions of Czarship, unlike their US counterparts who were told exactly what TFG is.