UNITED NATIONS (Sputnik) — The meeting was initiated by the United States and Japan, the source said.
Earlier in the day, an earthquake occurred in South Korea, prompting Seoul's suspicions that Pyongyang had performed another nuclear test. Later, North Korea confirmed that it had indeed tested a hydrogen bomb, and that was a sucess.
South Korean Foreign Ministry condemned on Wednesday the North Korean nuclear test, calling it a challenge to the international peace and a violation of the UN Security Council resolutions.
South Korean intelligence claims that North Korea did not notify the United States and China about their plans to conduct a nuclear test, the Yonhap agency reports, citing a representative of South Korean intelligence service.
In 2003, Pyongyang withdrew from the international Nuclear Non-Proliferation Treaty (NPT), a deal that was intended to prevent the spread of nuclear weapons manufacture and possible use.
In 2005, North Korea declared itself a nuclear power, and conducted several nuclear weapons tests, sparking concerns in the international community, particularly in neighboring South Korea. Almost four years later, Pyongyang tested additional nuclear weapons.
The official data on the country's nuclear program has not been released, and research on the issue is based on external observations and reports made by North Korean authorities.
In December, North Korean leader Kim Jong Un said the country had a hydrogen bomb and was ready to use it to "protect its sovereignty and national dignity."