Ukraine's president accused North Korea on Thursday of deploying officers alongside Russia and preparing to send thousands of troops to help Moscow's war effort, although NATO's chief said there was no evidence of Pyongyang's presence at this stage.

Ukrainian President Volodymyr Zelenskyy says his country has intelligence information that 10,000 troops from North Korea are being prepared to join Russian forces fighting against his country, warning that a third nation wading into the hostilities would turn the conflict into a “world war.