Is it worth making a forced choice of interface language in the Russian-English application for the CIS?

Question

Android

In the application Russian and English. If, for example, Ukrainian or Belarusian is selected in the system, then everything is displayed in English, and maybe Russian is closer to someone.
Is it worth making a choice of language for a limited set of countries, for which ones and how?

Answer 1

Language selection should always be
Default English - ok
Ask subscribers to translate the app

Answer 2

There is no need to do this, a significant number of users will not use it. Better take on something new, no need to come up with features for one application.

Answer 3

Before the initial start of the application, give users the opportunity to select a language.