More than 400 illegal immigrants have been arrested near Moscow's Bykovo Airport, police said on Thursday.

"It was revealed that Tajik and Uzbek nationals have been living illegally in the area of Bykovo Airport," an Interior Ministry statement said. "Over 400 people have been rounded up."

Last month, 72 illegal immigrants were arrested in a makeshift camp in western Moscow. In April, police uncovered an illegal underground city in the same area which even had its own mosque.

Earlier this week, Russia's Supreme Court upheld a ban on the ultra-right Movement Against Illegal Immigration (DPNI) which calls for curbs on the inflow of migrants.