File photo : Palestinian President Mahmud Abbas (C-R) meeting with Spanish Prime Minister Pedro Sanchez (C-L) on the sidelines of the 34th Arab League summit in the Iraqi capital Baghdad. AFP
Countries Israel had long counted on as allies have been adding their voices to growing international pressure after it expanded military assaults in Gaza.
A two-month aid blockade has pushed over two million Palestinians to the brink of famine.
Aid organisations say the trickle of supplies Israel has allowed to enter in recent days falls far short of needs.
Madrid will host 20 countries as well as international organisations on Sunday with the aim of "stopping this war, which no longer has any goal", Spanish Foreign Minister Jose Manuel Albares told France Info radio.
Humanitarian aid must enter Gaza "massively, unimpeded, neutrally, so that it is not Israel who decides who can eat and who cannot", he said.
A previous such gathering in Madrid last year brought together countries including Egypt, Jordan, Qatar, Saudi Arabia and Turkey as well as European nations such as Ireland and Norway that have recognised a Palestinian state.
Sunday's meeting, which also includes representatives from the Arab League and the Organisation of Islamic Cooperation, will promote a two-state solution to the Israeli-Palestinian conflict.
After the European Union decided this week to review its cooperation deal with Israel, Albares said "we must consider sanctions, we must do everything, consider everything to stop this war".
Israel has killed at least 53,901 Palestinians in Gaza since the war began in October 2023.
*This story was edited by Ahram Online.
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