Does that mean that if a US woman goes topless on a beach in France she can be arrested because it is illegal here?
If you do something illegal, no matter what it is, in a country where it IS illegal, you can get arrested. That's how it supposed to work
They did nothing illegal outside of Israel. Where does Israel get the Justification to arrest outside of Israel?
They were commiting a crime AGAINST the state of Israel. that's the justification.