North Korea had set an end-of-year deadline for the US to come up with a new denuclearisation deal that would involve significant sanctions relief and said it would otherwise adopt a "new path".

On Saturday, US President Donald Trump said he still hoped to reach an agreement.

Mr Trump made pursuing diplomacy with North Korea a centre-piece of his foreign policy agenda in 2018 but has failed to extract significant concessions on denuclearisation despite holding two summits with leader Kim Jong-un and even setting foot in North Korea.

The latest test took place at the Sohae satellite launch site, which the US once said Mr Kim had promised to close.