Just to send my admiration to Russian parents who live abroad
At no point have I seen a Russian parent talking to his/her child any other language but Russian. I'm based in the UK. In contrast, most of the Polish people talk to their children in English, even if their English is pretty poor. I can't see the reason why you would speak to your child any other language but your native. Children will learn the language of the country they are in at school anyway.