They can defend themselves against the threats from DPRK by anything that is available to them. For example, they get THAAD, a modern weapon which can help them against DPRK stronger than the past. However, they also get in trouble with China because of THAAD so they have to balance these two issues. According to what they’ve mentioned, ROK can discuss with China that THAAD doesn’t influence to the security of China. And they should not let the U.S.-ROK alliance become too detached from the real security.

They can defend themselves against the threats from DPRK by using any resources that are available to them.

One such example is THAAD, a modern weapon that is stronger than the previous non-nuclear weapons that they could have used to defend against DPRK.

However, they can also get in trouble with China by using THAAD, so they have to find the proper balance.

According to certain sources, ROK can discuss with China on using THAAD in a way that doesn’t affect the security of China.

And they should be careful not to diminish the U.S.-ROK alliance, which is important to the security of ROK.