Ukrainian President Zelensky also said that Russia was teaching North Korea "how to wage war, improve its weapons, and gain real combat experience."

Ukrainian President Volodymyr Zelenskyy says Russia is preparing to receive another 30,000 troops from North Korea, as well as new launchers for ballistic missiles.

"Russia wants to bring in another 30,000 North Korean troops," President Volodymyr Zelensky said in his nightly address on July 25.