To let search engines know these CMS pages relate to different languages, you have to add hreflang tags to them.
To add hreflang tags to CMS page in Magento 2:
1. Navigate to Content > Elements > Pages, choose the page you want to add the alternate hreflang tags to and press the Edit button.
2. Find the Alternate Store View Localizations section and set the alternative page. Just start entering the page title in an alternative language section and choose the corresponding page from the dropdown.
Note: pay attention to the language of the page you're on.
e.g. if you are on an English page, enter the alternative Ukrainian page.
Once you save the page, there is no need to go to the alternative page to set hreflang tags there as well. Our Hreflang Tags Extension for Magento 2 does it automatically.
3. Go to the storefront to check the hreflang tags for the CMS page you've just set.
In case you manage a website in a language that has different variants e.g. US English, GB English, AU English you need to add country code in hreflang tags as well.
Find the corresponding option in the hreflang tags configuration guide.