This thread is resolved. Here is a description of the problem and solution.
Problem:I have problem this website http://www.smartservice.ee . Everywhere russian language works but homepage not work.
Solution:I have test your URL and found that there is an active 301 redirection added by Yoast Premium.
I believe you should be able to go to Yoast SEO->Redirects->301 and review any active redirects , removing them should resolve this issue.
NOTE: After removing the redirect please clear your browser cache or test on an incognito window.
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