Any further Israeli aggressions on Syrian territory would issue a "declaration of war", Syrian President Bashar Assad said, a source was reported as saying Monday in the Kuwait daily Alrai.
According to the report, Assad notified Washington via Moscow that orders had been given to allow deployed ground-to-ground and ground-to-air missile batteries to be used against Israel without advance notice in the event of another attack.
Syria had stationed missile batteries aimed at Israel in the aftermath of alleged Israeli air strikes in the country, the website of Lebanon's Al Mayadeen TV - considered close to the regime of President Bashar Assad - quoted a top Syrian official as saying on Sunday.
The report came as Syrian Information Minister Omran Zoabi said on Sunday that alleged Israeli air strikes against three targets on the outskirts of Damascus "open the door to all possibilities."
The minister's comments at a press conference came after an emergency cabinet meeting organized to respond to what a Western source said was a new strike on Iranian missiles bound for Lebanon's Hezbollah.
Earlier on Sunday, Syria's Deputy Foreign Minister Faisal al Mekdad told CNN that Israel's air strikes in the country were interpreted as an Israeli "declaration of war" on the Assad regime.
In an interview with CNN, Faisal said that Syria would respond in a manner of its own time and choosing.
Israel has not commented on two airstrikes early Sunday morning and early Friday, that it allegedly carried out according to foreign media reports.
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Reuters contributed to this report.