U.S. Monitoring North Korea After Country's Threat Of 'Christmas Gift'

As Christmas approaches, tensions rise with North Korea's promise of a 'Christmas present' amid failed nuclear disarmament talks with the US. Pyongyang has resumed missile tests, setting a year-end deadline for a better US offer. The US, South Korea, and Japan maintain high military readiness. The Trump administration plans to seek increased UN sanctions if testing resumes but has no plans to intercept missiles.

What are the US, South Korea, and Japan maintaining in response to North Korea?

What plans does the Trump administration have if North Korea resumes testing?