It's a war economy. Russia builds a lot of tanks, mans a large army, pays a lot to the families of the fallen, it all adds a lot to the GDP.

But those tanks are going to burn, they don't add value to the economy, won't be exchanged for foreign goods. If you dig a hole into the ground, you increase the GDP, war destruction is not much different in its value creation. GDP is not a perfect measure of an economy.

A) Russia is large enough that it doesn't really need foreign trade to have an economy B) We -- ie "the west" have no control over what India and China does wrt russia. If they keep buying Russian oil, we can't stop them.