The US has criticised a decision by Google Executive Chairman Eric Schmidt and former diplomat Bill Richardson to visit North Korea.
State Department spokeswoman Victoria Nuland said: "Frankly, we don't think the timing of this is particularly helpful," citing North Korea's launch of a long-range rocket in December.
She said Schmidt and Richardson would be travelling as private citizens, not representatives of the US Government.
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The US President said more sanctions would be imposed under a campaign of "maximum pressure" on the North Korean regime.
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