Israel, who supports ISIS (which makes Israel a terrorist state) thinks that she can set the rules in Syria. A defining characteristic of likudniks is their delusional belief in their own superiority in... everything (reminds of anything?), even despite the fact that, realistically, Israel's renome was made by fighting grossly inadequate Arab militaries. Her both legitimate and not so much security concerns and strategies revolve around her big daddy US, whose entire foreign policy is utterly subverted by Zionist lobby and, putting it in a more down to earth language, US being this proverbial Israel's bitch. This, plus being in the pockets of Saudi Arabia and other Gulf satrapies' pockets. A dramatic change of the situation in Syria in the last two years in favor of Assad and final destruction of ISIS presents Israel with a serious challenge. So much so that she thinks, which is their MO for decades, she is smarter than everybody else and she can continue to fly missions in support of ISIS, who for Israel is a much more preferred option than secular Arab society. Especially if this society may build a competent army and start asking questions, say, about Golan Heights.
Now Israel threatens to destroy Syria's Air Defense. The issue here, however, is this: does Netanyahu still think that Putin (Russia) is so sublime that he can continue to BS him or does he understand that Putin knows pretty much most of what Israel wants and does? As silly as it may sound, but the former is more likely than the latter. Israel's arrogance and bluster, the same as a complete lack of sense of scale and proportion, are legendary, which is a defining characteristic of culture in that area. And here is the situation, unlike the US which does what Israel wants, Russia doesn't. What may happen, if Israel continues to do stupid things, forget if her vaunted Air Force kills accidentally (??) Russia's servicemen in Syria, is to abruptly and unexpectedly reveal to Israel (and the world) a brand new Syrian Air Defense and Air Force (wink, wink) which will operate not outdated and obsolete S-200s but something more capable which will make the "weather" over Syria very rough for flying and at this stage the only "ace" in Israel's sleeve left is her Air Force. The myth of Israel's superiority in technology and combined arms operations was completely dispelled in 2006. Obviously, one may expect the subsidiary of Israel's Knesset, US Congress, to start going apoplectic almost immediately but it wouldn't matter--Russia doesn't have AIPAC and neocon mafia and Russia's military and political history dwarfs that of Israel who, at some point of time, will have to face geopolitical realities of the 21st century and, maybe, stop BSing the nation which lost tens of millions of own citizens (including very many Soviet Jews who fought valiantly in the Red Army) in stopping, among many other atrocities, a Holocaust. Not that it wasn't known that it was BS from the get go in Syria. Is it the time to start distributing yarmulkes at the Capitol Hill?