[driftdiver]

“Leaves have been cancelled and rumours are thick in Seoul that government is even drafting young men into the army in an emergency.”

Not a draft. Pretty much all young men are required to serve a minimum enlistment. After that they are pretty much in the reserve.

[Yosemitest]

When I was last in the ROK,
South Korean men were required a minimum of two years compulsory service in the South Korean Military, but that was 1996.

Do you have any ideal how much destruction can be done,
flying 4 fighter jets, 1 mile apart, line abreast, at mach 1.5 or better, when crossing the border.
And that doesn't account for their weapons discharge.