Japan has set up anti-missile defences on the Okinawa islands ahead of a planned rocket launch by North Korea.
A Japan naval vessel transported Patriot missiles and related radar equipment to the port of Ishigaki island on Wednesday.
The North Korean state news agency announced a week ago, the intended launch of a satellite into space, some time between the 10th and 22nd of December.
Senior representatives from Japan the US and South Korea condemn the launch as a disguised ballistic missile test that violates UN resolutions.
"We all agree that we will continue diplomatic efforts until the last minute. The international community will take firm action if North Korea goes ahead with the launch," said Shinsuke Sugiyama, Head of the Japanese Foreign Ministry's Asian and Oceanian Affairs Bureau.
The J-alert emergency warning system has been tested across Japan, to swiftly let the public know if the missile falls into Japanese territory.
The flight path is similar to that of a failed launch in April.
The Japanese government has given orders to intercept the rocket if it appeared to be falling towards Japan.