Russia may require working immigrants to prove their fluency in Russian

Not much detail from this article in Spanish - anyone have further knowledge on this bill?

The Lower House of the Russian Parliament has introduced a bill that requires immigrants to confirm their knowledge of the Russian language, if they intend to work in public services and trade.

If approved, immigrants would have to present a document certifying their fluency in Russian. The certificate could be one obtained at secondary schools in CIS countries, or a certificate that proves that the student has taken a state test of the Russian language.