British Prime Minister David Cameron is in Japan as he tours East Asia trying to boost trade between the UK and countries in the region.
It is his first visit to Japan as prime minister, after an earlier trip was cancelled because of the eurozone crisis.
Making the trip with him are some of the UK’s leading defence contractors, as the two countries are expected to sign a deal that will see them developing weapons together for the first time.
Cameron will also discuss North Korea’s planned rocket launch with Japanese prime minister Yoshihiko Noda.
Speaking about Pyongyang’s decision, Japanese Foreign Minister Koichiro Gemba said: “I will be working on getting the cooperation of various nations at the G8 to show a strong will in calling on North Korea to restrain itself.”
Japan is threatening to shoot down the North Korean rocket if it poses a threat to Japanese territory.
Pyongyang insists the rocket, celebrating the 100th birthday of the country’s founder Kim Il-sung, will only be used to carry a weather satellite.