TOKYO (Sputnik) — On Wednesday, Pyongyang announced it had carried out the first test of a hydrogen bomb. The allegation has not yet been confirmed. Following the announcement, the UN Security Council said it would begin work on anti-Pyongyang measures in a new resolution.
"The United States drafted [sanctions] and launched consultations with the parties involved. Japan’s stance had been announced to the United States before sanctions were drafted," a source in the Japanese Foreign Ministry said, as quoted by the Kyodo news agency.
Earlier in the day, the upper house of Japan's parliament unanimously adopted a resolution condemning North Korea's alleged fourth nuclear test.
North Korea declared itself a nuclear power in 2005 and conducted nuclear tests in 2006, 2009 and 2013, having earlier withdrawn from the Nuclear Non-Proliferation Treaty that it ratified in 1985.