According to the report, Syria is waiting for the outcome of a meeting of Arab foreign ministers, to be held in Cairo on Thursday, before officially announcing its intention not to attend next week's summit.
Syria has declared in the past it would only take part in the peace conference if the Golan Heights, which Israel captured from it in the 1967 Six-Day War, is on the agenda.
Syria received an official invitation to the summit on Wednesday. Charge d'Affaires Michael Corbin, the highest ranking U.S. diplomat stationed in Damascus, delivered the invitation letter to the foreign ministry's chief of protocol, the diplomats in the Syrian capital told reporters.
"The Syrians are getting what they want even if the Golan is not explicitly mentioned. The letter talks about United Nations resolutions and the Arab peace initiative, which Syria supports" one of the diplomats said.
"There will even be a session in the conference on comprehensive Middle East peace. Syria will be seen as deliberately trying to spoil Annapolis if it does not show up," the diplomat said.
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