North Korea has started sending troops to fight with Russia in Ukraine, South Korea’s spy agency has said as Seoul warned of a "grave security threat".
The allegation comes a day after Ukrainian President Volodymyr Zelensky said he believed 10,000 North Korean soldiers could join the war, based on intelligence information.
South Korean President Yoon Suk Yeol called for a security meeting on Friday and said the international community must respond with "all available means".
According to the spy agency, 1,500 troops have already arrived in Russia – with anonymous sources telling South Korean media the final figure could be closer to 12,000.
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