"Everything is connected," Macron told delegates at the annual Paris Peace Forum in the French capital.

"Today, there are very vulnerable countries who, if we don't help them with international solidarity, will be dragged into the ongoing conflict," he added, in reference to Israel's war on Gaza.

The International Monetary Fund on Thursday announced $1.2 billion in aid for Israel's neighbour Jordan, which lacks natural resources of its own and relies on foreign assistance.

It is concerned about a possible new inrush of Palestinian refugees, adding to the hundreds of thousands already on its territory.

IMF managing director Kristalina Georgieva said on Friday the Washington-based body could also do "more" to support Egypt, also dealing with fallout from the conflict.

This year's Peace Forum opened against a backdrop of proliferating conflict around the world.

Most acute is the month-long Israeli bombardments of the Gaza Strip that has so far killed more than 10,800 people, many of them children, according to the Palestinian health ministry.

Pope Francis, who did not attend the Peace Forum, sent the summit a "message of encouragement, in hope that this meeting... can contribute to building a fairer, more united and peaceful world".

"Building peace is slow and patient work, requiring courage and commitment," the pontiff added.

"While reaffirming the inalienable right to legitimate self-defence and the responsibility to protect those whose existence is threatened, we owe it to ourselves to admit that war is always a defeat for humanity," Francis wrote.

*This story was edited by Ahram Online