The warning came after Pyongyang said it had successfully tested a new kind of ballistic missile on Sunday that was capable of carrying a nuclear warhead.
Apart from its threat to the United States, North Korea's latest provocation poses a clear test of Moon Jae-in. Through sanctions and restrictions on technology transfers, the worldwide community was so far only able to delay and increase costs for North Korea, but otherwise has failed to stop the country's nuclear ambitions.
But he slammed the latest missile test as a "reckless provocation" after holding an emergency meeting with national security advisers.
In other words, reverse decoupling assumes that the USA can only militarily act against North Korea as long as the US mainland is not targeted by a North Korean ICBM.
It appears to have not only demonstrated an intermediate-range ballistic missile (IRBM) that might enable them to reliably strike the United States base at Guam, but more importantly, may represent a substantial advance to developing an intercontinental ballistic missile (ICBM).
The UN Security Council first imposed sanctions on North Korea in 2006 and has strengthened the measures in response to its five nuclear tests and two long-range rocket launches.
The test "proved to the full all the technical specifications of the rocket" which was "capable of carrying a large-size heavy nuclear warhead", KCNA said.
"I'm not going to talk about various policy options that we may or may not consider, but I will say this: we are certainly engaged right now in looking at a number of measures - political, economic, security - to deal with these provocative acts by the DPRK, and risky acts in many cases", he said.
It was different because it flew high more than twelve hundred miles up, and more than 400 miles out, close to Russian Federation.
Crackpot North Korean leader Kim Jong-un is believed to making a play for his country to co-host the 2030 World Cup by joining forces with South Korea, China and Japan.
But the US still firmly opposes the North's nuclear and ICBM development. In February, North Korea used a "lofted" trajectory to test its new KN-15 solid-fueled missile.
One source said if two or three booster engines are combined, the maximum range would increase to more than 10,000 km.
North Korea's official Korean Central News Agency called the launch a new type of "medium long-range" ballistic rocket that can carry a heavy nuclear war head. Spokesman Moon Sang Gyun said it is still unlikely that North Korea has re-entry technology, which would return a warhead safely back into the atmosphere.
North Korea has in the past year stepped up its ballistic missile tests, firing dozens of various types of rockets, according to South Korea.
At the request of the United States and Japan, the United Nations Security Council will convene an urgent session today to discuss the situation.
The envoys will meet with high-ranking officials to explain the new South Korean government's policy plans and exchange opinions on how to develop bilateral relations, the presidential Blue House office said.
U.S. Pacific Command said it tracked the flight of Sunday's missile and is "working closely with our Republic of Korea and Japanese allies to maintain security".
"They have the overwhelming dominant economic relationship with North Korea and because they have the greatest leverage, they have the greatest responsibility", he added. According to the United States administration, it is possible to show influence on Pyongyang only with the help of sanctions.