Transfers of soldiers are said to have already begun, according to Nis, reports the news agency Yonhap. The authority publishes satellite images that are said to show how a first group of 1,500 soldiers is sent to Vladivostok. The soldiers are to be trained in Russia and then sent to the front, according to Nis.
NATO's Secretary-General Mark Rutte says he cannot yet confirm the reports, but condemns North Korea's actions regardless.
They are helping to fuel Russia's war in every way they can, says Rutte at his press conference after NATO's defense minister meeting in Brussels.
South Korea's president is said to have called an emergency meeting on Friday, following reports of the transfer.
Demanding a strong reaction
Russia launched its full-scale invasion of its neighboring country in February 2022. The relationship between the communist dictatorship North Korea and Moscow has become even warmer since the outbreak of the war, and there are reports that dictator Kim Jong-Un has long been assisting Russia with weapons.
Ukraine's Foreign Minister Andrij Sybiha demands a strong reaction from the country's allies.
"We demand an immediate and strong reaction from the Euro-Atlantic community and the world," he writes in a statement.
"Dangerous provocation"
On Thursday, Ukraine's President Volodymyr Zelenskyj said in a conversation with US ex-President Donald Trump that the war-torn country sees two ways forward: Either become a member of NATO or acquire nuclear weapons.
Russia's President Vladimir Putin sees Zelenskyj's statement as a "dangerous provocation". He says it is not difficult to "create nuclear weapons in the modern world".
I don't know if Ukraine is capable of doing it now, he says during a press conference.
