Around 1,500 soldiers have already arrived in Russia, with an estimated total of 12,000 to come, reported South Korean media.
Ukraine’s President Volodymyr Zelenskyy accused North Korea this week of preparing to send soldiers to help Moscow’s war effort against Ukraine.
There are conflicting accounts as to whether there are already North Korean troops in occupied Ukraine.
On the frontline, Ukraine’s air defences shoot down 80 out of 135 Russian drones