Russian President Vladimir Putin has signed into law his country’s strategic partnership with North Korea, which includes a mutual defense provision, according to a decree published today.

The accord, signed by Putin and North Korean leader Kim Jong Un in June following a summit in Pyongyang, calls for the two countries to rush to each other’s aid in the event of an armed attack.

The upper house of the Russian parliament ratified the treaty this week, while the lower house adopted it last month. Putin signed a decree on that ratification, which appeared today on a government website for legislative initiatives.

The treaty confirms the closest relations between Moscow and Pyongyang after Russia launched its February 2022 invasion of Ukraine.

According to reports from South Korea and Western countries, North Korea has supplied weapons to Russia. Ukrainian experts say they have found traces of these weapons on targets of Russian attacks.

Ukrainian President Volodymyr Zelensky said on Thursday that North Korea has sent 11,000 troops to Russia and some of them have been killed in fighting with Kiev forces in the southern Russian region of Kursk.

Russia has not confirmed the presence of North Korean troops.