North Korea has announced plans to launch a satellite sometime over the next week. Pyongyang notified the Japan Coast Guard on Monday, saying it will happen sometime before or on June 3rd.

The projectile is expected to fall either in the Yellow Sea, southwest of North Korea, or in the Pacific Ocean, east of the Philippines. Those areas are outside Japan's exclusive economic zone.

Coast guard officials are urging vessels in those waters to be on alert for falling objects.

The announcement came before a trilateral summit between Japan, China and South Korea.

Speaking from Seoul, Japanese Prime Minister Kishida Fumio urged Pyongyang to cancel the launch.

Kishida also said, "If North Korea moves ahead with the launch, it would be a violation of UN Security Council resolutions."

Pyongyang claims to have launched its first military spy satellite, the Malligyong-1, last November.

Expert analysis shows that it is successfully orbiting Earth, passing over an Air Self-Defense Force base and a US military base, both in Japan.

Kataoka Haruhiko is the Vice President of the Japan Institute for Space and Security, and a former chief of staff with the Air Self-Defense Force. He says the existing satellite is likely taking images during daylight hours.

Kataoka also said: "The orbit of the Malligyong-1 is very similar to Japan's own information-gathering satellites. I think this one will be an optical satellite and it'll probably be launched as planned."

Other experts believe North Korea's technical expertise now rivals that of the American SpaceX Falcon 9 rocket.