We have made a Webcast in collaboration with the Aritmosoma (https://www.aritmosoma.pt) accountancy company answering the most common doubts about the Portuguese fiscal system for Ukrainians!!
This link provides a quick intro to the Portuguese tax system.
If you consider staying in Portugal for a relatively short-term (some years) and you have specific technical expertise, this may be interesting for you:
We will provide a more in-depth explanation soon. For any specific questions, please refer to the Telegram chat.