It's a common fallacy that money equates to purchasing power. That is only true so long as there continues to be a market with stable supply and stable prices. After COVID-19, many people had plenty of money, but you simply could not buy masks or vaccines at any price if there simply were no longer any to be sold.

Militaries are just as interconnected as anybody else. They depend on supplies of weapons and munitions. If the supply is gone, the size of the budget doesn't matter.