Japan moves defence system closer to flight path of North Korea missiles
Japan has moved a mobile missile-defence system on the northern island of Hokkaido to a base near recent North Korean missile flyover routes.
Defence Minister Itsunori Onodera said a Patriot Advanced Capability-3 interceptor unit was deployed at the Hakodate base on southern Hokkaido "as a precaution" as part of government preparations for a possible emergency.
Tuesday's relocation came after a North Korean missile was test-fired last week and flew over southern Hokkaido and landed in the Pacific off the island's east coast, the second flyover in less than a month.
The PAC-3 was brought from another base in Yakumo town on Hokkaido, about 50 miles north east of Hakodate.
The system has a range of about 12 miles.
Four more of Japan's 34 PAC-3 units, largely used to defend the capital region, were relocated to southwestern Japan recently after North Korea warned of sending missiles toward the US territory of Guam.
Japan currently has a two-step missile defence system.
First, Standard Missile-3 interceptors on Aegis destroyers in the Sea of Japan would attempt to shoot down missiles mid-flight.
If that fails, surface-to-air PAC-3s would try to intercept them.
Japan's Constitution, which limits the use of force to self-defence, only allows the military to shoot down missiles that are heading to Japan, or debris falling onto Japanese territory.
Mr Onodera has said a new security law passed in 2015 might allow it to shoot down a Guam-bound missile if it poses a critical security threat to Japan and its top ally, the United States.