There are three languages on the site: Russian (default), English, Ukrainian. They are turned on by clicking on a specific link, after which the user writes a cookie (ru, en, ua) and connects the dictionary of his language.
The search robot can follow the link, but cannot write a cookie. Accordingly, only the default version will be indexed. How to make it index and other versions?
Ps: create separate versions using subdomains (en.site.ru) is not suitable.