Russian President Vladimir Putin has not denied reports that North Korean troops are in his country. His comment came at a news conference on Thursday after the BRICS summit.

When asked about satellite images showing the troops were in Russia, Putin said, "If there are images, then they are reflecting something."

The Russian president also said Moscow is in touch with Pyongyang, calling them friends. South Korea's defense minister claimed the troops are wearing Russian uniforms and acting under Moscow's command. He also said 12,000 soldiers will be dispatched.

Ukrainian officials say the first units were sent to the Russian region of Kursk. Kyiv has launched an offensive in the area and considers it a "combat zone."

They believe the Kremlin has "high hopes for the North Korean component" in the war.

The Russian Parliament on Thursday ratified the country's comprehensive strategic partnership with North Korea. That is the treaty Putin signed with North Korean leader Kim Jong Un in June.

They agreed their forces would provide what they called "all means" of military assistance if either country was attacked.