The U.N. Security Council will meet Wednesday to discuss North Korea's launch of a long-range rocket in defiance of threats of sanctions, a Western diplomat said.

"The Japanese and the Americans have requested a Security Council meeting, which will take place late Wednesday morning" around 11:00 am (1700 GMT), the diplomat said.

Japan's chief government spokesman Osamu Fujimura told reporters in Tokyo that the Japanese envoy had already called for U.N. Security Council president Morocco to "swiftly summon" the council to a meeting.

The Western diplomat predicted the special talks would likely see a "strong response" at the council to the rocket launch that Seoul, Tokyo and their Western allies swiftly condemned as a disguised ballistic missile test that violates U.N. resolutions triggered by Pyongyang's two nuclear tests in 2006 and 2009.

North Korea had confirmed hours earlier the launch of a long-range rocket and said it had succeeded in its mission of placing a satellite into orbit.

A previous launch of the same Unha-3 rocket in April had ended in failure, with the carrier exploding shortly after take-off.

In 2006, the Security Council imposed an embargo against North Korea on arms and material for ballistic missiles and weapons of mass destruction. It also banned imports of luxury goods and named individuals and companies to be subject to a global assets freeze and travel ban.

In 2009, it imposed a ban on North Korea's weapons exports and ordered all countries to search suspect shipments.

According to Japanese reports, Japan, the United States and South Korea have agreed to demand the Security Council strengthen sanctions on North Korea to levels that match those on Iran.

That would include increasing the list of financial institutions, entities and individuals subject to asset freezes.

Much will depend on the stance taken by U.N. veto holder China, North Korea's sole major ally and its biggest trade partner and aid provider. (AFP)