Don't be worried about this:
The strike should affect flight operations in the following countries: Albania, Belgium, Bulgaria, Croatia, Cyprus, Denmark, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Macedonia, Malta, Montenegro, Norway, Netherlands, Poland, Portugal, Roumania, Serbia, Spain, Slovenia and Switzerland.
That's taken from the list of ATCEUC member countries. Many on that list will not be involved in any action.