At this point it's literally a war crime. Claim denial and accidents all they wanted before, but if the sailors are outright acknowledging it was intentional to attack civilian infrastructure, it's by definition a war crime
Germany has supported Israel with weapons whilst knowing they were committing a Genocide, so the answer for Germany is probably "Yes", at least as an accomplice.
The answer for the Republic Of Ireland is as far as I know "No".
I don't think it's officially a war. So it's a regular crime and I think that's also better, because the victim country can react more quickly and more powerful.