Dear Professor Daryl Press, Yea, yea... I agree.

Tell it to the marines too.

Why are you telling me now? Is it somewhat outdated and too late?

Anyway, thanks for your consideration of the South Korean situation.

Please let Joe Biden know.

https://www.washingtonpost.com/outlook/should-south-korea-go-nuclear/2021/10/07/a40bb400-2628-11ec-8d53-67cfb452aa60_story.html

The alliance between the United States and South Korea seems as if it should be stronger than ever. America is finally shifting its strategic attention to Asia, aided by the end of its “forever war” in Afghanistan. Meanwhile, the growing North Korean nuclear threat should be energizing shared U.S. and South Korean interests in denuclearization and deterrence. At a glance, the bonds that lock Seoul and Washington together appear solid.

In fact, the alliance is in trouble — pulled apart by powerful geopolitical forces. The only way to save it might be for South Korea to move in a direction that much of Washington considers unthinkable: to develop an independent nuclear arsenal.

Seoul may already be heading in this direction. Former foreign minister Song Min-soon has said that South Korea “taking its own measures to create a nuclear balance on the peninsula” is an idea “widely touted” by leaders and analysts. Seventy percent of the South Korean public endorses the move. And Seoul’s new fleet of ballistic missile submarines is an unusual acquisition: a vastly expensive way to deliver a handful of conventional missiles. Those subs, however, would make an ideal platform for a future nuclear deterrent.

A South Korean nuclear arsenal is not what Washington prefers — indeed, it goes against a core U.S. policy of preventing nuclear spread. But it might be the best course given the weakened foundation of the alliance. If Seoul decides to take this step, the United States should focus blame where it belongs — on Pyongyang’s illegal nuclear program — and render political support to a valued ally

I agree with two professors from Dartmouth.Great Britian and France 

armed with nuclear weapons because of Soviet Union. There is no reason

for South Korea not to have home made nuclear weapons as a deterrent 

against NK and Chinese nuclear threat. U.S. was concerned with nuclear 

spread to Taiwan, Japan and South Korea if NK is allowed to be legitimate 

nuclear nation. But once U.S. lets 3 countries have nuclear weapons protecting 

them from NK and China, she does not have to worry about NK nuclear weapons.

Then South and North exchange begins because sanction will be lifted.

A quote from the above article;

"...But North Korea’s development of nuclear weapons was illegal, violating multiple United Nations Security Council resolutions. South Korea would be legal and justified. The NPT’s Article X was written for precisely the circumstances that South Korea faces today. It offers a withdrawal option if a member faces “extraordinary events” that “have jeopardized the supreme interests of its country.” North Korea’s illegal development of nuclear weapons and its threats against the South certainly qualify as extraordinary circumstances. South Korea’s development of nuclear weapons would be a proportional response to North Korea’s actions..."

Now, why should South Korea ask the U.S for her permission to arm with nuclear weapons?

The damn permission had been written out loud and clear as you see here !!