South Korea’s military conducted a live-fire exercise simulating an attack on a nuclear site, to "strongly warn" North Korea in response to the rogue nation's apparent nuclear test, South Korean officials said early Monday.

A surface-to-surface missile and long-range air-to-ground missile "accurately struck" targets in the Sea of Japan, Seoul's Joint Chiefs of Staff said.

Officials added that the target was set considering the distance to where the North's test site was, and the exercise was aimed at practicing precision strikes, as well as cutting off reinforcements.

President Donald Trump tweeted Sunday that "North Korea is a rogue nation" and that "their words and actions continue to be very hostile and dangerous."

He added that South Korea is realizing their "talk of appeasement with North Korea will not work," before tweeting that the U.S. is considering cutting trade with any country that does business with North Korea.