Media captionThe BBC's John Sudworth asks North Korea's vice-foreign minister what message he has for Donald Trump.
North Korea will continue to test missiles, a senior official has told the BBC in Pyongyang, despite international condemnation and growing military tensions with the US.
"We'll be conducting more missile tests on a weekly, monthly and yearly basis," Vice-Foreign Minister Han Song-ryol told the BBC's John Sudworth.
He said that an "all-out war" would result if the US took military action.
Earlier, US Vice-President Mike Pence warned North Korea not to test the US.
He said his country's "era of strategic patience" with North Korea was over.
Mr Pence arrived in Seoul on Sunday hours after North Korea carried out a failed missile launch.
Tensions have been escalating on the peninsula, with heated rhetoric from both North Korea and the US.
Mr Han told the BBC: "If the US is planning a military attack against us, we will react with a nuclear pre-emptive strike by our own style and method."
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