I think the only thing Hamas succeeded in doing is to expose Israel's evil acts to the world for a little while, until the west says "..., anyway" and goes back to being best buddies with Israel, singing and chanting how righteous they are.
So far the only thing that's close to a sanction from the EU is Norway divesting from some Israeli companies[0] and the EU _proposing_ (!) to suspend Israel from a research program[1].
That will show 'em!
[0]: https://www.reuters.com/sustainability/society-equity/norway... [1]: https://ec.europa.eu/commission/presscorner/detail/en/ip_25_...