Interesting. The older I have gotten, the more my perspective has shifted the other way - it is predominately zero sum. So do you consider China or Russia to be a greater threat?
Short term, Russia. Long term, China. Russia's long-term prospects remain pretty weak for a whole host of reasons, China's remain much better but they are also encumbered by significant issues as well. Neither one of them wants an open conflict with us though, it would be way too costly for them, but they will constantly try and test what our boundaries are especially with a President who is such an unknown still in the foreign policy arena.