you want to serve WordPress on multiple domains without canonical redirects (e.g., keep users on mydomain.com.ua or mydomain.pl depending on what they visited), without forcing everything to redirect to the "Site Address (URL)" in WordPress settings.
This is absolutely possible, but WordPress has some default behavior you need to override.
✅ Goal Recap Same WordPress instance serves both mydomain.pl and mydomain.com.ua
No automatic redirect to the canonical domain (e.g., from .com.ua → .pl)
Multilingual pages work on both domains (e.g., /en, /ru)