It won’t. But it might make them sell it cheaper somewhere else, resulting in lower spend on the army. Also, think of all Russian businesses loosing money. Their owners will be pushing the government to fix the situation. At the end of the day, money is power, you don’t want to loose it.
Ma’s case is not a good example though. The guy was alone and his empire didn’t vanish, just changed ownership.
I’m not an expert on Russia, but I’m sure that they’re not self sufficient and that to be able to trade with anybody, they’ll need to exchange their currency. Alone, they might end up like Jack Ma