If the game is recognized as a "World" version rather than a region-locked "CIS" (Commonwealth of Independent States) key, Steam will trigger a download queue. It will acquire the English asset packs (often several gigabytes) and replace or append the Russian files. Upon launch, the game will default to English.
If that fails, go to your AppData folder ( %appdata% ), find the Capcom folder for SFxT, open config.ini with Notepad, and manually change the language line from "russian" to "english". street fighter x tekken change language russian to english
If you have a retail or non-Steam version, you may need to manually update the registry key to switch from Russian (code 1049) to English (code 1033). Press Win + R , type , and press Enter. If the game is recognized as a "World"