North Korea has officially reported it as a successful nuclear test with a lighter warhead that delivers more force than before, but has not revealed the exact yield. analysts do not believe that a hydrogen bomb was detonated.
Multiple South Korean sources estimate the yield at 6–9 kilotons, while the German Federal Institute for Geosciences and Natural Resources estimates the yield at 40 kilotons. Seismic data collected so far suggests a 6-9 kiloton yield and that magnitude is not consistent with the power that would be generated by a hydrogen bomb explosion.
Japanese Prime Minister Shinzō Abe had warned the North to not launch the rocket, and if it did and the rocket violated Japanese territory, it would be shot down.
Nevertheless, North Korea launched the rocket anyway, claiming the satellite was purely intended for peaceful, scientific purposes.
Several nations, including the United States, Japan, and South Korea, have criticized the launch, and despite North Korean claims that the rocket was for peaceful purposes, it has been heavily criticized as an attempt to perform an ICBM test under the guise of a peaceful satellite launch. have responded to North Korea's ongoing missile and nuclear development with a variety of sanctions; most recently, on March 2, 2016, the U. Security Council voted to impose additional sanctions against North Korea.
China also criticized the launch, however urged "the relevant parties" to "refrain from taking actions that may further escalate tensions on the Korean peninsula". In 1963 North Korea asked the Soviet Union for help in developing nuclear weapons, but was refused.
The Soviet Union agreed to help North Korea develop a peaceful nuclear energy program, including the training of nuclear scientists.
Later, China, after its nuclear tests, similarly rejected North Korean requests for help with developing nuclear weapons.
North Korea's nuclear weapons program dates back to the 1980s.
North Korea and weapons of mass destruction concerns North Korea (officially the Democratic People's Republic of Korea or DPRK), which declared in 2009 that it had developed a nuclear weapon, and possessed a small stockpile of relatively simple nuclear weapons.
North Korea may also have a chemical weapon and/or biological weapons capability.
On October 9, 2006, North Korea announced it had successfully conducted its first nuclear test.
An underground nuclear explosion was detected, its yield was estimated as less than a kiloton, and some radioactive output was detected.