Amid increasing global concern over the launch, which the US and its allies consider to be illegal, Japan’s Sankei Shimbun newspaper claimed today that a 15-strong delegation from Tehran has been in the country advising the North Koreans since the beginning of March.

The experts include senior officials from the Iranian rocket and satellite producer Shahid Hemmat Industrial Group, the newspaper said.

The Iranians brought a letter from President Ahmadinejad to the North Korean leader Kim Jong-Il stressing the importance of co-operating on space technology, it added.