Unfortunately, it is extremely difficult for the children born and raised outside of Russia to learn the language properly. Even if Russian is the tongue their mother speaks, it is not their "mother tongue", so to speak. (What a word play! ) If a child spends more time speaking a language of the country he/she was born and raised in, he/she learns more words, grammar usage, idiomatic expressions in that language, which is foreign to his/her parents.
Reality suggests, that most of these children will resist speaking Russian with their parents at some point and others will speak it with a dreadful accent.
Sorry to be a wet blanket, but the times of the Russian aristocrats who could speak at least 2 or 3 languages fluently in addition to their native Russian has passed, and those living and raising their children abroad nowadays are not necessarily bringing up polyglots.
This is a rather sensitive topic to touch upon, as some children cease speaking at all if forced to learn Russian by their well-intending parents.
Cheers!
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How to Learn Russian for Bilingual Children
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for teenagers https://espaniero.online/ispanskij-dlya-podrostkov it would be easier to learn it)