Seoul has already made it clear that it will not seek military retaliation, and Washington and Beijing have said all the right things about trying to ensure that "cooler heads" prevail, as China's State Councilor, Dai Bingguo, said in talks with U.S. Secretary of State Hillary Clinton in Beijing on Tuesday. But all concerned parties understand that at a moment of high tension, the possibility of hot war breaking out is not negligible.
How might a shooting war start? Defense analysts and military sources in Seoul and Washington agree that an outright, all-out attack by either side is unlikely. Even a nuclear armed North, a Seoul-based defense analyst says, "would not risk an all-out war because it would be the end of the regime. Period, full stop." But there are ways in which smaller skirmishes could break out, and if they aren't contained, they could conceivably lead to disaster. Here are three that are uppermost in defense planners' minds: