While your logic makes sense, there is far more to war then economics, otherwise the middle east wouldnt be a mess, and then there is the vietnam war.
Something has changed greatly. It is the fall of globalism and the rise of nationalism. Putins reminder he has the will to use MAD is sign of the new times.
Maybe but either way the era of USA unilaterally pushing wars just ended.
Russia with their hypersonic nukes and proxy wars wins have just made western imperialism via war and culture have very high costs.