National Security Adviser H.R. McMastersaid Saturday that the chances of war between North Korea and the United States are "increasing every day".
"What is clear is every time - every time - he conducts a missile launch, a nuclear test, he gets better", McMaster said.
Meanwhile, South Korean media showed six US Air Force F-22 Raptors, Washington's top-of-the-line stealth fighters, arriving in South Korea on Saturday to participate in the Vigilant Ace 18 air combat exercise, an annual US-South Korea drill the US Air Force says is created to boost the "combat effectiveness" of the alliance.
North Korea said it successfully tested a powerful new ICBM on Wednesday that put the entire US mainland within range of its nuclear weapons.
The DPRK test fired a new type of intercontinental ballistic missile (ICBM) - "Hwasong 15 "- last week which it said could hit the entire territory of the United States, thus marking the completion of DPRK's rocket weaponry system, according to Pyongyang's own description of its nuclear and missile system.
It flew 600 miles (950 km) before splashing down in waters near Japan and is potentially capable of striking targets as far as 8,100 (13,000 km), which would put Washington within reach.
China should take unilateral action to cut off North Korean oil imports, McMaster said, adding, "you can't shoot a missile without fuel".
To celebrate the missile launch the ruling Workers Party's official daily Rodong Sinmun covered its front page with colour photographs showing thousands of tightly packed soldiers and people applauding in Pyongyang's Kim Il-Sung square, which was decorated with large portraits of the North's late leaders.
"This week we had the long range missile, ICBM launch, which again gathered the attention of the world and we feel that it needs to be discussed", Bessho said at a news conference.
The initial analysis shows Tuesday's launch likely involved a two-stage missile with a non-explosive dummy warhead, the official said.
A U.S. official said Saturday technical analysis of that missile's flight is ongoing but the "the North Koreans had problems with re-entry".
The tension in the Korean Peninsula is extremely high.
North Korea has repeatedly rejected accusations of human rights abuses and blames sanctions for a dire humanitarian situation.