"The visit of the head of the Russian foreign ministry to North Korea is in the works," spokeswoman Maria Zakharova told AFP.

She said concrete dates would be announced separately, declining to comment further.

Earlier on Wednesday, business media outlet RBC reported that Lavrov would visit North Korea on May 31, citing the Russian foreign ministry's press department.

Last month North Korea's foreign minister Ri Yong Ho held rare talks with Lavrov in Moscow as Pyongyang moves to improve strained ties with global powers.

"Russia is as inclined as ever to develop good neighbourly relations with North Korea," Lavrov said at the time.

North Korea prepares this week to demolish a nuclear test site, which has been the staging ground for all six of the North's nuclear tests.

The North has portrayed the move as a goodwill gesture ahead of a planned June 12 summit between North Korean leader Kim Jong Un and US President Donald Trump in Singapore.

But doubts have since been cast by both sides on whether that historic meeting will take place