Localization - In routes method

Hi everyone. 
I'm trying to make multilanguage site with two languages (en, ru).
In app/config default lang set as 'en'.
I have a route with a locale placeholder like this:

Code:

$routes->get('/{locale}', 'Home::index');

When i open domain.com/ in the browser it shows me content in english.
When i open domain.com/en  - it gives me same content as above.
when i open domain.com/en/home - it gives me same content as above

The first question is how to avoid this kind of situation?
And i thought if i added 'locale' placeholder , then domain.com/ should give me 404 error, but not? Why?
And what is the best way to make multilanguage app in CI4?

Thanks in advance.

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