The release of the video comes after the head of Ukrainian military intelligence claimed that around 11,000 North Korean infantrymen are currently training in eastern Russia.
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A video purporting to show dozens of North Korean soldiers lining up to collect Russian military fatigues has been released by Ukrainian officials, who say it shows the introduction of troops sent by Pyongyang into the conflict.
The video, published by Ukraine's Centre for Strategic Communications and Information Security, which operates under the Culture and Information Ministry, allegedly shows North Korean soldiers standing in line to pick up bags, clothes and other apparel from Russian servicemen.
"We received this video from our own sources. We cannot provide additional verification from the sources who provided it to us due to security concerns," said Ihor Solovey, the head of the centre.
"The video clearly shows North Korean citizens being given Russian uniforms under the direction of the Russian military," he said.
"For Ukraine, this video is important because it is the first video evidence that shows North Korea participating in the war on the side of Russia. Now not only with weapons and shells but also with personnel."
The centre claims the footage was shot by a Russian soldier in recent days but didn't say how the footage was obtained.
The location is unknown.
It comes after the head of Ukrainian military intelligence, Kyrylo Budanov, claimed in local media that about 11,000 North Korean infantrymen were currently training in eastern Russia.
He predicted they would be ready to join frontline fighting by November.
"The emergence of any number of new soldiers is a problem because we will simply need new, additional weapons to destroy them all," he said.
"The dissemination of this video is important as a signal to the world community that with two countries officially at war against Ukraine, we will need more support to repel this aggression."
If true, the presence of North Korean soldiers in Ukraine would be further proof of intensified military ties between Russian President Vladimir Putin and North Korean leader Kim Jong Un.
Last summer, they signed a strategic partnership treaty that commits both countries to provide military assistance.
North Korean weapons have already been used in the Ukraine war.