The remarks by Maj. Gen. Amir Eshel today echoed statements by Israel's military chief of staff a day earlier.
"A surprise war could take shape today in many configurations," Eshel said at a strategy conference in Herzliya, near Tel Aviv. "Isolated incidents can escalate very quickly and require us to be prepared in a matter of hours to operate throughout the entire spectrum ... To utilize all the capabilities of the air force," he said.
He said Russian S-300 air defense systems are "on their way" to Syria, though Israel asked Russia not to supply the advanced air defense system to Syria.
Syrian and Israeli forces briefly exchanged fire on the Golan Heights border yesterday, prompting Israel's military chief, Lt. Gen. Benny Gantz, to accuse Syrian President Bashar Assad of encouraging and directing operations against Israel and warning he would "bear the consequences" of escalation.
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Tensions have been rising between Israel and Syria in recent weeks. Israel is believed to have carried out airstrikes said to be aimed at weapons meant for the Lebanese Hezbollah. Israel has not confirmed carrying out the attacks.
"Syria is changing before our eyes. If tomorrow it collapses, we could very quickly find that great arsenal dispersed and directed at us," Eshel said.