I think the tags still work. Problem with that is merging or renaming a tag used by someone else.
My recommendation is to create a project first, then use the functionalities Move to project or Copy to project to assign codes to it (see here).
- If you are certain that only you are using those codes in Russian, then you can move them to your project.
- If you doubt that others might be using them, then copy them into your project instead.