Trump derides North Korea missile claim
Donald Trump has dismissed North Korea's claim to be developing missiles capable of striking America.
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In a tweet, the US president-elect derided the claim by North Korea's Kim Jong-un that preparations were in the final stage, saying: "It won't happen."
It was not clear if Mr Trump was expressing doubts about North Korea's nuclear capabilities or was planning preventative action.
Mr Trump also berated China for failing to help rein in its ally North Korea.
"China has been taking out massive amounts of money & wealth from the U.S. in totally one-sided trade, but won't help with North Korea. Nice!" Mr Trump tweeted.
In a televised New Year message on Sunday, Mr Kim Jong-un said North Korea was close to testing long-range missiles capable of carrying nuclear warheads.
He said the country was now a "military power of the East that cannot be touched by even the strongest enemy".
North Korea has conducted two nuclear tests over the last year, raising fears that it has made significant nuclear advances. But it has never successfully test-fired long-range missiles capable of carrying nuclear warheads.
Experts estimate it might take less than five years. UN resolutions call for an end to the country's nuclear and missile tests.
Prof Siegfried Hecker of Stanford University in California told the BBC in September that North Korea's ability to field a missile fitted with a nuclear warhead capable of reaching the US "is still a long way off - perhaps five to 10 years".
North Korea claims to have developed heat-tolerant materials that would allow long-range missiles to re-enter the atmosphere, but many Western experts have cast doubt on this.
Prof Hecker also worries that North Korea's technological ability increases the likelihood of the spread of nuclear weapons to "non-state actors" or "terrorists".