North Korea's decision to meet US President Donald Trump proves the US strategy of isolating North Korea is working, according to US Vice‑President Mike Pence.
Pence says the US has made "zero concessions" and would maintain pressure until denuclearisation was achieved.
The agreement to hold an unprecedented summit stunned observers.
But the White House later said North Korea would have to take "concrete steps" before any meeting.
Only months ago, Trump and North Korean leader Kim Jong‑un were hurling insults at each other.
But now Trump has agreed to the meeting following an invitation delivered by South Korea. No sitting US president has ever met a North Korean leader.
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