A large Russian farm celebrated its female North Korean workers by throwing a concert, releasing a video of dozens of DPRK laborers likely employed at the facility in violation of U.N. sanctions.

The Agro-Invest agricultural complex, based in Russia’s Kaluga region southwest of Moscow, held a tree-planting procession and a concert “with the participation of workers from the DPRK,” according to a social media post and video footage released by partner company Eco-Culture on Saturday.

“The event aimed not only to improve the area, but also to strengthen teamwork,” the post read.