Japan and the United States have successfully tested the Aegis ballistic missile defense system on Tuesday.
Japan’s picked a new $1.2 billion radar for its two ground-based Aegis ballistic missile defense sites.
The price for two Aegis Ashore batteries could exceed $5.4 billion -- over twice the amount initially cited by the Japanese government.
The announcement contrasts with long-term moves to increase Japan's missile defense capabilities.
Move part of Japanese fortification of first island chain against Chinese fleets.
Amid a growing Chinese naval presence, Japan is considering additional steps to protect Miyako Strait.