The fact is that the Israeli ambassador [to Russia] was summoned for a conversation only a day after he submitted his credentials [to the Russian Foreign Ministry last Thursday], and was told categorically that this game is over.
Assad was quoted in comments translated into Russian that "any military operation in Syria that does not have the consent of the Syrian government is illegal".
On Friday, Israeli planes attacked several targets in Syria.
The sharp uptick in tensions on Israel's northern border has resulted in increased rhetoric by both senior Israeli political and military officials, with the hardline defence minister, Avigdor Lieberman, warning that Israel would not hesitate to "destroy" Syria's air defence system if it fired on Israeli jets again.
The Syrian media reported that the country's Defense Ministry claimed that one Israeli plane was downed and another was damaged from anti-aircraft fire.
Last week, Prime Minister Benjamin Netanyahu visited Moscow, where he asked the Kremlin to make sure Iran does not gain a foothold in the area.
Israel has a long record of violating Syrian airspace with impunity that stretches back to before 2011, when the country's current armed conflict began.
According to the nrg news site, the strikes Thursday were against targets affiliated with Hezbollah, possibly on a weapons shipment to the Shiite terrorist group, which is based in Lebanon but is fighting in Syria alongside Assad's forces against rebels and Sunni militants.
"The Syrians must understand that they are held responsible for these arms transfers to Hezbollah and that if they continue to allow them then we will do what we have to do".
Though the Israeli military has denied any of its fighter jets were shot down, it did say Friday that it had intercepted several anti-aircraft missiles.