North Korea is set to treble the number of its troops fighting for Russia along the front lines with Ukraine, sending an additional 25,000 to 30,000 soldiers to assist Moscow, according to an intelligence assessment from Ukrainian officials.

Kim Jong-un highlighted Pyongyang’s support for Russia’s war in Ukraine by showing his people, for the first time, images of North Korean soldiers fighting alongside Russian troops.

An emboldened Russia has ramped up military offensives on two fronts in Ukraine. That is scattering Kyiv’s precious reserve troops and threatening to expand the fighting to a new Ukrainian region as each side seeks an advantage before the fighting season wanes in the autumn.

On Tuesday the White House said that it had cut off some weapons deliveries to Ukraine in order "to put America's interests first".

Ukraine is forging ahead with early plans for joint weapons production with some international allies, top officials said, while warning Wednesday of potential consequences of the U.S. decision to halt some arms shipments promised to help Kyiv fight off Russia's invasion.