It was earlier reported that Pyongyang has launched "four ballistic missiles" into the East Sea amid the joint US-South Korean military drills.
Japan's Chief Cabinet Secretary Yoshihide Suga stated earlier that the DPRK launched four missiles in direction of the Sea of Japan, adding that three of them landed in Tokyo's exclusive economic zone some 250 kilometers west off the Japanese coast.
"We have already held contacts with the United States and South Korea, but now we are also considering the possibility of contacts with China and Russia," Kishida told journalists.
"We will insist on full implementation, first of all by China and other concerned states, of the UNSC resolutions, including the 2321 resolution [prohibiting the tests]," Kishida added.
Japanese media reported that the move of Pyongyang resulted in at least two sessions of the National Security Council to discuss the issue and the second meeting was held after a phone conversation between US and Japan's national security advisers.
Earlier in the day, North Korea reportedly launched four missiles from northwestern part of the country. According to the Japanese Defense Ministry, three of them plunged into the Sea of Japan within the Japanese exclusive economic zone and did not inflict any damages.