"First and foremost we are preparing for next week's conference on Syria to ensure an opportunity to re-launch the peace process under the auspices of the United Nations," Mogherini said here.
Syria would "top the agenda" at Monday's summit of EU Foreign Ministers in Brussels, she said.
"We will reach some conclusions and reiterate our shared position in the name of the 28 member states - as I have laid out over the past two days - especially on the use of chemical weapons and our reactions to this."
"It seems clear to me that fresh impetus needs to be given at this time to relaunch the political process led by the UN," she said.
Arab League leaders on Sunday condemned the "criminal" use of chemical weapons in Syria and called for an international investigation, Saudi Foreign Minister Adel Al-Jubeir told reporters after the summit.
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