Few people in Russia use Google for Russian language searches, this is because Google is not as good at declining Russian nouns and conjugating Russian verbs. Yandex gives more results of a higher quality for certain searches.
That has no bearing on whether Chinese businesses care. Obviously there are tons of Chinese businesses that sell outside China, including retail businesses, and their customers DO use Google.
Same for the Russian case.
So a reasonable explanation is that Russians are increasingly using Google's apps: gmail, google calendar, the google now launcher; which probably has something to do with the fact that these apps come preinstalled on their phones. Not necessarily that they prefer Google for searching for Russian-language websites.
This is not true, Google has >20% share in Russia iirc