On Sunday, North Korea denied supplying weapons to Moscow after the United States said the nuclear-armed country had supplied Russia's private military group, Wagner, with missiles and rockets.
Washington earlier this month designated the Wagner Group as a "transnational criminal organization," citing its arms dealings with Pyongyang in violation of UN Security Council resolutions.
The White House has shown US intelligence photos of Russian railroad cars entering North Korea, picking up a shipment of infantry and missile launchers, and returning to Russia, according to national security spokesman John Kirby.
In a statement from the official KCNA news agency, a senior North Korean official dismissed the accusations, warning that the US would face a "really undesirable outcome" if it continued to spread "self-made rumours".
"Trying to tarnish the image of (North Korea) by fabricating a non-existent thing is a grave provocation that can never be allowed and that cannot but trigger its reaction," Kwon Jong-gun, director general of the Department of US Affairs, said.
He also called it "a foolish attempt to justify its offer of weapons to Ukraine."
Earlier this week, US President Joe Biden promised to provide 31 Abrams tanks, one of the most powerful and advanced weapons in the US military, to help Kyiv fight off Moscow's invasion.
The move drew a rebuke on Friday from Kim Yo-jong, the powerful sister of North Korean leader Kim Jong-un, who accused Washington of "further crossing the red line" by sending tanks into Ukraine.
During a meeting with South Korean Foreign Minister Park Jin in Seoul on Sunday, NATO Secretary General Jens Stoltenberg acknowledged concerns about Pyongyang's "reckless missile tests and nuclear programs" and the fallout from the Ukraine war in South Korea.
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