Hello,
We apologize for the issue you are facing with your sitemap. It sounds like there may be specific errors related to the Russian version of your sitemap that need to be addressed. Here are some steps you can take to troubleshoot and potentially resolve the issues:
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Validate Your Sitemap: Use a sitemap validation tool to check for any errors in your sitemap. You can use the Validate XML Sitemap tool to see if there are any issues detected.

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Check for Content: Ensure that the Russian version of your site has content. If all posts/pages are set to noindex or if there is no content, it could lead to an empty sitemap.
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Flush Permalinks: Sometimes, flushing permalinks can resolve sitemap issues. Go to Settings → Permalinks in your WordPress admin area and click Save Changes without making any changes.

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Review Robots.txt: Make sure that your robots.txt file is not blocking any important pages from being indexed. You can check this in Rank Math SEO → General Settings → robots.txt.
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Check for Plugin Conflicts: Use the Health Check plugin to identify any potential conflicts with other plugins that might be affecting your sitemap.
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Custom Canonicals: If you have set custom canonical URLs for your posts, ensure that they are not causing the posts to be excluded from the sitemap. Rank Math includes self-referencing canonicals by default.
If these steps do not resolve the issue, please reply to this ticket, and a human agent from the Rank Math Support team will take over and assist you further. Thank you for raising this concern!
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.