Kim Jong-un dialing up the pressure on Washington

Kim Jong Un warns North Korea would 'pre-emptively' use its nuclear weapons if threatened by 'hostile forces'

• North Korea has said it could preemptively use nuclear weapons if under threat

• Leader Kim Jong Un gave the warning at a military parade in capital Pyongyang

• Nukes could be used to prevent 'escalating nuclear threats from hostile forces'

• North Korea showcased the biggest weapons in its nuclear arsenal on Monday

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