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 paid public tribute to North Korean soldiers killed in Russia’s war against Ukraine, part of an effort to cement the two countries’ strategic defense pact.

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.