The Taoiseach says a failure to de-escalate tensions between Iran and Israel could result in 'catastrophe and bloodshed' for millions of people in the Middle East.
Simon Harris has been speaking in Brussels ahead of a two-day summit of European Leaders.
He says Israel has 'moved beyond defending itself' - replacing reason with "revenge" in Gaza,
Simon Harris wants the EU to use its influence to ensure maximum restraint.
'I'll continue to use the opportunity of being here to continue my engagement with European counterparts about the need for an immediate ceasefire in Gaza, the need for the release of all hostages, but also for the need, I believe, for a number of European states to now move ahead and recognize the state of Palestine.'