Olmert, keen to talk up peace prospects as he clings to office in the face of mounting corruption allegations, told reporters: "It seems to me that we have never been as close to the possibility of reaching an accord as we are today."
For Assad, Sunday's summit signalled a spectacular emergence from isolation in the West three years after the assassination of former Lebanese Prime Minister Rafik al-Hariri, which many believe was orchestrated from Damascus.
The red-carpet treatment was partly a reward for Syria's backing of a Qatar-brokered peace deal that pulled Lebanon back from the brink of civil war in May, and for starting indirect peace talks with Israel via Turkish mediation.
German Chancellor Angela Merkel said she told Assad at a private meeting: "We've heard enough words exchanged, now we want to see deeds."
Merkel, initially hostile to Sarkozy's initiative because the original plan was to exclude northern EU states, said France and Germany planned to host a conference on developing solar energy as a key resource in the Mediterranean region.
Both wanted to promote economic development to help reduce migratory pressure from North Africa to Europe, she said.
The final summit communique, issued after hours of wrangling over the wording on the Arab-Israeli conflict, voiced support for the Israeli-Palestinian peace process but omitted any direct mention of a two-state solution.
A Palestinian official said President Mahmoud Abbas was still seeking to have that paragraph removed after the French hosts distributed the text, saying Abbas had approved it.
The leaders also welcomed the announcement of indirect peace talks between Israel and Syria under the auspices of Turkey.
France and Egypt co-chaired the summit but detailed arrangements on the future of the co-presidency and secretariat were postponed to November due to persistent disagreements.
In a compromise, the Arab League will not receive formal observer status but will be invited to meetings of the EU-Mediterranean partnership known as the Barcelona process.
French Foreign Minister Bernard Kouchner identified climate change, the environment, access to water and energy, migration and dialogue between civilisations as key areas for cooperation.
The new organisation aims to pursue practical projects with EU and private sector funding, such as cleaning up the Mediterranean Sea, using North Africa's plentiful sunshine to generate solar power, and building road and sea highways.
Algerian President Abdelaziz Bouteflika told his country's official APS news agency that the union may struggle to finance its projects because it was not clear where the funds will come from. But Sarkozy and Mubarak said money was not a problem.
