Bombs Away! Koreas Exchange Artillery Fire - Does a Weak America Put the Planet in Peril?

With North and South Korea exchanging artillery fire and threatening recriminations, the U.S. bogged down and bankrupt, and the U.N. tragi-comically ineffective, are the world's hot spots at risk of blazing out of control?

Whatever you think of the U.S. and its policies, the absence of an omnipotent world power may set the stage for a cascading succession of turf wars or worse. Does a weak America leave humanity defenseless in a dangerous world?