Here's a North Korea option you didn't mention:
Now, as Mr. Kim’s grandson, Kim Jong-un, accelerates his nuclear missile program, South Korea is again preparing to target the North’s leadership. A day after North Korea conducted its sixth — and by far most powerful — nuclear test this month, the South Korean defense minister, Song Young-moo, told lawmakers in Seoul that a special forces “decapitation unit” would be established by the end of the year.
The brigade-size unit, unlike its earlier counterpart, would operate officially. The military has been retooling helicopters and transport planes to penetrate North Korea at night so that the forces, known as the Spartan 3000, can carry out raids.
Rarely does a government announce a strategy to assassinate a head of state, but South Korea wants to keep the North on edge and nervous about the consequences of further developing its nuclear arsenal. At the same time, the South’s increasingly aggressive posture is meant to help push North Korea into accepting President Moon Jae-in’s offer of talks.
It is a difficult balancing act, pitting Mr. Moon’s preference for a diplomatic solution against his nation’s need to answer an existential question: How can a country without nuclear weapons deter a dictator who has them?
A "difficult balancing act" is one way to put it!