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.

President of the Ukraine Volodymyr Zelensky said in a press conference at the EU leaders summit in Brussels on Thursday that North Korea has joined war against Ukraine, according to Ukrainian National News (UNN).

Russia waging major new offensive in eastern Ukraine, mounting its biggest push since last winter. But it already appeared to have suffered heavy casualties.