15 January 2016, 16:29 GMT
TOKYO (Sputnik) — North Korea claimed on January 6 it had successfully tested a hydrogen bomb, but scientists around the word expressed skepticism over the claim and said it appeared to be a regular or enhanced fission Atomic bomb.
The international community denounced the test as provocative and undermining stability in the region.
"North Korea should be punished. We look forward to adopting a tough resolution in the shortest time," Saiki said following his talks with his US and South Korean counterparts, Antony Blinken and Lim Sung Nam, in Tokyo, as quoted by the Kyodo news agency.
The sides also called on China to back the adoption of a strict UN Security Council resolution against Pyongyang.
