A meeting of the "likeminded" countries was hastily arranged on the sidelines of a Group of 7 industrialised economies in Italy, days after the US for the first time launched airstrikes against Syrian President Bashar Assad's forces.
It came hours before Tillerson was to make a tense trip to Moscow to press Russia's leaders to finally abandon their support for Assad.
Though intended to punish Assad for a chemical weapons attack, the US strikes last week served to refocus the world's attention on the bloody war in Syria, now in its seventh year.
Today's meeting in the walled Tuscan city of Lucca, the G-7 countries were joined by diplomats from Muslim-majority nations including Jordan, Qatar, Saudi Arabia, Turkey and the United Arab Emirates.
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The inclusion of those countries is important because the US strategy for Syria involves enlisting help from Mideast nations to ensure security and stability in Syria after the Islamic State group is defeated.
Seated around long tables in an ornate, red-walled room, the diplomats smiled and exchanged pleasantries but made no remarks as photographers were allowed in briefly for the start of the meeting. The session lasted roughly an hour.
The US raised the stakes significantly on Monday when a senior US official said Washington has made a preliminary conclusion that Russia knew in advance of Syria's chemical weapons attack last week. Yet the U.S. Has no proof of Moscow's involvement, said the official, who wasn't authorized to speak publicly on intelligence matters and demanded anonymity.
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