North Korea may use the visit of Joe Biden as an excuse for their first nuclear weapons test in five years, US and South Korea officials fear.
Pyongyang resumed ICBM launches this year but it has not tested a nuclear bomb since 2017.
US and South Korean officials said North Korea appeared to be preparing another intercontinental ballistic missile test that could some as soon as today or Friday, despite the country's battle with its first admitted Covid-19 outbreak.
