This might very well be the perfect time for the chinese to put up or shut up about how dearly they'd like to engage American forces. My guess is, if they can't hit us from behind then blame it on someone else, they'll slink away like all cowards do when stood up to.
Neither the chinese nor the russians, and certainly not the norks have anything resembling a modern enough military to openly face the United States. Which is why they posture. Usually, when democrats occupy the White House posturing is enough, but the Obama administration clearly doesn't wish to seem weak, especially after being portrayed as helpless and incompetent while liberals took a beating in the mid-terms.