The meeting in the Tuscan walled city of Lucca that starts today aims to pressure Russia to end its support for President Bashar Assad.
Last week's nerve gas attack in the rebel-held town of Khan Sheikhoun that killed more than 80 people stirred President Donald Trump to strike for the first time at Assad's forces.
Italian Foreign Minister Angelino Alfano says Europe's broad support for the US military strikes contributed to a "renewed harmony" between the United States and its partners.
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