If your flight is cancelled due to a pilot strike within the European Union, you are generally entitled to a full refund of your ticket price under EU Regulation 261, as strikes are considered "extraordinary circumstances" beyond the airline's control, meaning you cannot usually claim compensation, but you can still get a refund or be rebooked on another flight;

https://www.flightright.com/blog/what-to-do-in-the-event-of-a-strike-at-the-airport#:~:text=Your%20flight%20has%20been%20canceled,overbooking%20and%20missed%20connecting%20flights.