The Japanese government released a statement on Tuesday morning, saying DPRK's missile launches violate UN Security Council resolutions, which bans DPRK's development of nuclear and missile technologies.
The statement also vowed to step up coordination with South Korea, the United States and other related countries to deal with the matter.
Japan's Prime Minister Shinzo Abe on Tuesday directed relevant departments to thoroughly gather and analyze information on missile launches by DPRK.
Meanwhile, Japan's Defense Minister Nakatani denounced the launches as provocative act that harm the peace and security of the global community, saying they absolutely cannot be accepted.
Nakatani also gave warning that further military threats are possible.
The DPRK reportedly launched three ballistic missiles Tuesday morning, following the launch of two last month, according to reports.