North Korea’s foreign minister has called US actions “alarming” as tensions over the North’s nuclear programme again flared.

Ri Yong-ho was responding to comments by US Secretary of State Mike Pompeo, who urged other countries to keep up sanctions pressure on Pyongyang.

A landmark summit between the two sides in Singapore in June saw the North agree to work towards denuclearisation.

But details remain vague and the UN says its nuclear programme continues.

At a regional forum, also in Singapore, Mr Pompeo said it was important to maintain “diplomatic and economic pressure” on North Korea to achieve “the final, fully verified denuclearisation”.

Pyongyang is currently under a range of international and US sanctions over its nuclear programme and missile tests.