The issue here is that Russia does not have that option at hand. If they institute a 100% economic blockade they lose out right because no one else will care.
No one ever thought about it. Russian billionaires and their children live in EU and get residence in EU countries, what economic blockade?
That is what I mean. Russia does not have the power to threaten one and therefore has to wield more crude tools to try get the point across. There's no possibility of Ukraine turning into North Korea through sanctions, rather for Russia.