Yes, but they can't do anything about it anyway. The FSF resolution on this matter, though, essentially means that they might just as well pull Euro-Office patches into OnlyOffice. So in the end, the product will be formed by combined effort.
The codebase will diverge quickly; the Russian one is heavily obfuscated with s ton of Russian in it and obscure commit messages. A large portion of prep work by Nextcloud was cleaning and translating. OnlyOffice was also known for refusing PRs, too.
> Pursuant to Section 7 of AGPLv3, the copyright holder is expressly entitled to impose additional conditions. In the case of ONLYOFFICE, such conditions include, in particular:
>the obligation to retain the original product logo (Section 7(b));
>the denial of any rights to use the copyright holder’s trademarks (Section 7(e)).
In other words you must use our logo and you must not use our logo. Good luck enforcing that.