| Speakers | Language | % Correct |
|---|---|---|
| 150 mil | Russian | 99%
|
| 45 mil | Ukrainian | 95%
|
| 9 mil | Bulgarian | 91%
|
| 12 mil | Serbian | 90%
|
| 15 mil | Kazakh | 89%
|
| 6.5 mil | Belarusian | 87%
|
| ~2 mil | Slavomacedonian | 76%
|
| 8.4 mil | Tajik | 74%
|
| 4.3 mil | Kyrgyz | 72%
|
| 5.2 mil | Mongolian | 68%
|
| 5.2 mil | Tatar | 52%
|
| 1.4 mil | Chechen | 29%
|