Professor Stephan Haggard from the University of California San Diego, who specialises in Korea-Pacific studies, said the United States is particularly concerned that North Korea has developed nuclear warheads that can be mounted on various missiles and tested a missile with an ICBM range last week.
The officials also agreed that North Korea posed a grave threat to the global peace and stability and reaffirmed the importance of coordination aimed at the "complete and irreversible" denuclearization of the Korean Peninsula.
The Hwasong-14 missile launched July 4 had a maximum range of about 4,163 miles, meaning it would be able to hit targets in Alaska but not the contiguous USA mainland or the larger islands of Hawaii in the Pacific Ocean.
Kim Jong-Un's wife has been spotted in public for the first time in four months as North Korea celebrates its first intercontinental ballistic missile test.
Idiosyncratic hits sung at the gig included Song of Hwasong Rocket and Make Others Envy Us.More news: Trillion-ton iceberg breaks off Antarctica
"It is a reminder that the USA has considerable presence in this region".
Forecasting the US reaction to the recent missile launch, the NIS was quoted as saying that the country may consider more unilateral sanctions on North Korea, while Russian Federation and China may increase calls to open dialogue with the North.
Also, 83 percent of respondents said that they had read, seen or heard about the North's launch of a Hwasong-14 missile.
On Tuesday, a member of the South Korean legislature's intelligence committee said his country did not believe the July 4 test had, in fact, demonstrated a re-entry capability.
Washington's inaction in taking the opportunity to get rid of one of the world's living ruthless leaders confirms Admiral Harry Harris' statement that the USA wanted "to bring Kim Jong Un to his senses, not his knees".
In Seoul, South Korean government agencies are challenging North Korea's claim of a "successful" Fourth of July ICBM test.