I don't think it's better outside Russia. But within Russia, the level of detail and the accuracy of data is much better. In Moscow and St Petersburg at least, you can see street level details down to individual buildings easily - I would say it's better than Google in NYC.

I do wonder if Google's poor performance in Russia, and Yandex's poor performance outside Russia are a function of data restrictions. I'm not sure western countries would be as keen to share data with a Russian company, and vice versa.