South Korea said it was monitoring for any further military activity in the North following Saturday's missile launches.
Seoul said it was monitoring for any further military activity in the North following missile launches Saturday and Sunday.
Japan is also deploying a homegrown fleet of spy satellites and radar to detect ballistic missile launches hundreds of miles offshore.
Security Council Resolutions 1718 and 1874 require Pyongyang to suspend all activities related to its ballistic missile program and to reestablish a moratorium on missile launches.
In addition to the interceptors, Mr. Hagel mentioned Pentagon plans to install a second advanced radar system in Japan to more quickly detect North Korean missile launches.
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Mr. Hagel also outlined a series of upgrades under development, including plans to install a second advanced radar system in Japan to more quickly detect North Korean missile launches.
WSJ: U.S. to Boost Missile Defenses in Response to North Korea
The United States missile defense systems would be employed to defend the United States against limited missile launches, and to defend its deployed forces, allies and partners against regional threats.
The U.S. military has become heavily dependent on orbital systems and their supporting ground networks to connect far-flung forces, collect vital intelligence, detect missile launches, provide precise navigation information, and monitor weather conditions.
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The scanning sensor will provide a wide area surveillance of missile launches and natural phenomena across the earth, while the staring sensor will be used to observe smaller areas of interest with superior sensitivity.
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But so similar is the launch technology that the outside world, including America and the United Nations Security Council (UNSC), has in the past insisted that a ban on missile launches also covers satellites.
We can detect missile launches with deployed technology.
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These dual independent sensors will enhance early warning of missile launches around the globe, support the nation's ballistic missile defense system, greatly expand our technical intelligence gathering capability, and bolster situational awareness for warfighters on the battlefield.
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The need to acquire as much information as possible before acting in a crisis situation also explains why the United States is currently orbiting a new generation of space-based infrared satellites that can detect missile launches and nuclear detonations within seconds after they occur.
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The Navy plans to continue using the extremely reliable Lockheed Martin D-5 ballistic missile, which has seen 135 consecutive test launches without mishap.
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