The United States will not impose new limits on Ukraine's use of American weapons if North Korea enters the fight, the Pentagon said on Monday, as NATO said North Korean military units had been deployed to Russia's Kursk region, Paralel.Az reports citing Reuters.

It could be a sign of how Russia hopes to offset mounting battlefield losses and continue making slow, steady gains in eastern Ukraine.

"The deepening military cooperation between Russia and North Korea is a threat to both Indo-Pacific and Euro-Atlantic security," NATO Secretary-General Mark Rutte told reporters after talks with a South Korean delegation about the North Korean deployments.