Saturday's chain of events began at 4:30 a.m. (0230 GMT) when an Israeli Apache helicopter shot down an Iranian drone over the northern town of Beit Shean, the Israeli military said. The cause of the F-16 crash is being investigated, Conricus said, adding that the IDF has not determined if anti-aircraft fire hit the jet.
"The government and army of Syria as an independent country have a legitimate right to defend (the country's) territorial integrity and counter any type of foreign aggression".
"The United States is deeply concerned about today's escalation of violence over Israel's border and strongly supports Israel's sovereign right to defend itself", State Department spokeswoman Heather Nauert said in a statement. "We share the concerns of many throughout the region that Iran's destabilizing activities that threaten global peace and security, and we seek greater worldwide resolve in countering Iran's malign activities", Rankine-Galloway said. And the Russian Foreign Ministry's statement on Saturday's escalation did not condemn Israel.
"We urge all parties involved to exercise restraint and to avoid any actions that could lead to an even greater complication of the situation", the ministry said.
U.S. Secretary of State Rex Tillerson is expected to visit the region in the coming week to discuss Syria and other issues, and is scheduled to visit Jordan, Turkey, Lebanon and other countries.
In Litvak's view, the Iranians are intent on continuing to establish military bases in Syria.
In a statement, it said Israel had targeted an air base in the Homs desert that is being used to fly drones in missions against Islamic State.
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"The fact that a drone like this is identified, tracked and intercepted so smoothly by the Israeli air force demonstrates our capabilities, demonstrates our resolve not to allow the breach of Israeli sovereignty", he said.
Conricus declined to give details on the drone's presumed mission or whether it was armed.
Open conflict across the Syrian border is unlikely to be in the interest of either Israel or Iran-aligned forces at the moment.
In a statement quoted by the Israel Broadcasting Corporation, Brigadier General Tomer Bar, a senior Israel Air Force officer, said the Israeli aircraft was downed by a surface-to-air missile but he did not specify.
Former Syrian lawmaker and political commenter Sharif Shehade said the anti-aircraft fire marked a political decision in Syria to respond to Israeli strikes, and that tensions would continue to rise unless Washington and Moscow intervened to calm the situation. And an Israeli military spokesman also warned that Iran is playing with fire by infiltrating Israeli airspace.
The regime said it intercepted the missiles and destroyed majority, according to SANA.
The Israeli military released grainy black and white footage of what it said was the drone's control vehicle in Syria being destroyed. Until this weekend, occasional responses by Syria and Hezbollah against Israel had caused little damage. "The risk is a direct confrontation between Israel and Iran that will encompass Syria and Lebanon".
A Russian warplane was shot down last week in Idlib.