Perhaps, more should have been made of this earlier, but the idea of boasting has come late. Before everyone forgets how few people called the US election correctly I would like to draw readers' attention to the post on the 18th of June, 2016, where not only the results of the US election, but the Australian election too, were predicted with 100% accuracy.

I do notice that there was one mistake in the post, however, the speech quoted as taking place on the 13th of July, actually took place on the 13th of June; which would make sense seeing as the post went up before the 13th of July.

It has been said that the US does not have a military option against North Korea. North Korea's ability to destroy Seoul if they are struck by the US makes a US strike on the North politically unthinkable, according to many.
However, if South Korea had a public split with the US, and could convince the North that they were totally against any US attack, then perhaps the North would not retaliate against Seoul if such an attack did come.
Somewhat ironically, if the South withdrew from its alliance with the US, over the current crisis then that could give the US more room to act.
And by the way
If the South distanced itself from the US it would also make China happier with the idea of a strike. China certainly doesn't want a full blown war on the Korean peninsula, and so it would oppose a strike if it thought that ran the risk of restarting the Korean War. If, however, there was to be a strike and no war, China could be quite happy about the North having its nuclear and ballistic weaponry removed.
This is just a by the way thought, though, because the US does not need any approval from China to decide whether it bombs North Korea or not.