Military officials said Pyongyang may want to send a strong message to the new U.S. president that it will not give up its nuclear and missile development programs despite international condemnations and sanctions.

“We are closely watching every move by the North Korean military at its Punggye-ri nuclear test site and other possible missile-launching sites. The military is fully prepared to respond to any provocative acts by the North,” an official from Seoul’s Joint Chiefs of Staff told reporters in a briefing.

Both the South Korean military and the U.S. forces stationed on the Korean Peninsula said they are utilizing all available resources to keep close tabs on the movement of missiles.