Why DPRK Withdrew from the Armistice Agreement? Who's Belligerent? NK? US?

Why has North Korea withdrawn from an armistice agreement that has kept overt hostilities on the Korean peninsula at bay since 1953? Does the withdrawal portend an imminent North Korean aggression? Hardly. North Korea is in no position to launch an attack on its Korean neighbour, or on the United States, at least not one that it would survive. North Korean forces are dwarfed by the US and South Korean militaries in size, sophistication and fire-power. The withdrawal serves, instead, as a signal of North Korean resolve to defend itself against growing US and South Korean harassment, both military and economic