You're assuming that Russia is all but defeated, but that's an assumption that may not hold. China has recently agreed to provide military assistance to Russia, likely drawing out the conflict further. Rather than prevent war, we may have given our adversaries the economic means to wage a way more intense war than would have been possible otherwise. Surely, Russia wouldn't have as much support had we not bankrolled Russia and its allies for decades. America's trade policies have greatly enriched hostile nations. America has enjoyed global hegemony for a long time, but other countries are sick of picking up the scraps. They want America's seat at the table.

In many ways, the theory that interconnected trade promotes peace is similar to the neo-liberal economic view that globalization promotes lower prices and thus more efficient economies. Such a view has been shown to be an over-simplification and ignores important side-effects of changing trade balances, such as rising economic inequality and the rise of populism.