Why do both north and south korea remain in a state of heightened military readiness?
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Both North and South Korea remain in a state of heightened military readiness in order to revert back spontaneously during attacks and save themselves from huge damage due to inactivity.  

Explanation:

The state of heightened military readiness is said to be when the forces are fully prepared for any unforeseen circumstances. This increases the reacting efficiency of the forces when provoked. The Korean War led to the separation of North Korea from South Korea.

The military in North Korea is 4th largest military in the world. Both North Korea and South Korea are prone to sudden attack hence they are always in a state if heightened military readiness.

pepin the short[a] (german: pippin der kurze, french: pépin le bref, c. 714 – 24 september 768) was the king of the franks from 751 until his death. he was the first of the carolingians to become king.[b][2]

the younger son of the frankish prince charles martel and his wife rotrude, pepin's upbringing was distinguished by the ecclesiastical education he had received from the monks of st. denis. succeeding his father as the mayor of the palace in 741, pepin reigned over francia jointly with his elder brother carloman. pepin ruled in neustria, burgundy, and provence, while his brother carloman established himself in austrasia, alemannia and thuringia. the brothers were active in suppressing revolts led by the bavarians, aquitanians, saxons, and the alemanni in the early years of their reign. in 743, they ended the frankish interregnum by choosing childeric iii, who was to be the last merovingian monarch, as figurehead king of the franks.

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his