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North Korean leader Kim Jong Un guides on the spot the underwater test-fire of strategic submarine ballistic missile in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on April 24, 2016. KCNA/via REUTERS

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WASHINGTON (Reuters) - The United States is preparing to defend itself against North Korea, positioning its missile development systems and setting up a "shield" to counter low-level threats from an "erratic" country, U.S. President Barack Obama told CBS in an interview that aired on Tuesday.

"One of the things that we have been doing is spending a lot more time positioning our missile development systems, so that even as we try to resolve the underlying problem of nuclear development inside of North Korea, we're also setting up a shield that can at least block the relatively low-level threats that they're posing now," Obama said.

(Reporting by Washington newsroom; Editing by Chizu Nomiyama)

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