North Korea launched more missiles on Saturday, the latest in the most prolific series of tests since U.S. President Donald Trump took office.
The first missile was launched at 6:45 a.m. local time on Saturday and the second one about 15 minutes later, according to South Korea's Joint Chiefs of Staff.
While North Korea has refrained from criticizing Trump directly, its foreign minister condemned U.S. Secretary of State Mike Pompeo in a statement released on Friday, just hours before the missile test.
But in recent weeks, North Korea has repeatedly criticized the United States and South Korea's largely computer-simulated joint military drills, South Korean importation of high-tech weapons such as F-35 stealth jets, and USA testing of its intermediate-range cruise missile as threatening and hindrances to dialogue.
"North Korea's repeated launches of projectiles and missiles show North Korea is working on developing such technology".
The last missile firing came about a week ago on August 16. The chief US diplomat noted the six tests of short-range ballistic missiles that North Korea has conducted in recent weeks, and appeared to diverge slightly with President Donald Trump, who have dismissed the tests as unthreatening and insignificant."I wish they would not do that", Pompeo said of the tests.
"We're open to all possibilities. But we don't rule out the possibility that it test-fired a fresh type today", a military officer said.
Pyongyang has repeatedly expressed anger at US-South Korean military exercises that have been taking place.
The pact will expire in November.
"Our military is tracking the movement in the North in case of additional launches", the JCS said in a statement.
"He likes testing missiles", he said of Kim, adding that the North Korean leader "has been pretty straight with me - and we're going to see what's going on".
Trump has downplayed the North's recent missile tests as "very standard" and insisted they do not break the North Korean leader Kim's promise to refrain from nuclear or long-range missile tests.
But on Friday, the North vowed to "remain as the biggest "threat" to the US" if Washington persisted with sanctions, in a statement by Foreign Minister Ri Yong Ho.
There have been signs of the resumption of dialogue, after South Korea and the USA wrapped up their combined military exercise this week which North Korea has denounced as a rehearsal for invasion.
"If the USA attempts to stand against us with sanctions without abandoning its confrontational posture, it would be a miscalculation", he said.
After the launches Saturday, Trump focused on the fact that the launches haven't violated Kim's promise past year to suspend long-range missile and nuclear tests.
The North kept up its harsh criticism of sanctions imposed because of its nuclear and missile programmes.