Minister Tomomi Inada has been reported to be considering the purchase of a missile defense battery similar to the Terminal High-Altitude Area Defense system the Pentagon deployed to Guam more than two years ago.
The Marianas Variety reported that the US deployed the system in response to missile-launch threats from North Korea.
North Korea has threatened to launch missile attacks toward Guam and other US military bases in the Asia-Pacific region, including Japan and South Korea.
Japan's minister was also understood to have been updated on the progress of Japan government-funded projects in Guam for the relocation there of almost 5,000 US Marines from Okinawa.
