Ukrainian President Volodymyr Zelensky said Monday that North Korea's military cooperation with Russia poses a mounting threat to the Asia-Pacific region. In this July 28 photo, Zelensky (L) attends the funeral service for late Sen. Lindsey Graham in Washington, D.C. File Photo by Annabelle Gordon/UPI | License Photo

SEOUL, Aug. 11 (UPI) -- Ukrainian President Volodymyr Zelensky warned Monday that North Korea is gaining battlefield experience and improving its military capabilities through its support for Russia, posing a growing threat to U.S. allies and other countries in the Asia-Pacific region.

In an address from the presidential office in Kyiv, Zelensky said North Korea was preparing to send a new contingent of troops to Russia and had supplied Moscow with additional ballistic missiles.

"This is the first time in Russia's history that they no longer have a secure strategic rear," Zelensky said. "For the first time, they cannot wage war without reinforcements from North Korea."

North Korea has sent munitions and roughly 15,000 troops to support Russian forces in the Kursk region, according to South Korea's National Intelligence Service, which estimates that about 2,000 of the deployed troops have been killed.