If we're talking military only, then you have to look at defense budgets, not GDP. The US defense budget is still much bigger than China's and Russia's combined, even after controlling for PPP.
By "what a country can accomplish on the world stage", I meant a more holistic view of what a country can do, such as investing, R&D, exploration, etc. (and also military).
By "what a country can accomplish on the world stage", I meant a more holistic view of what a country can do, such as investing, R&D, exploration, etc. (and also military).