The immediate tensions stem from an Israeli air strike on what they claimed was an Iranian drone facility at the so-called T-4 air base, near Palmyra, on 9 April, which reportedly killed several Iranian military advisers.
Iran vowed to respond and since then there have been sporadic incidents that appear to be Israeli efforts to thwart just such a response.
There was an Israel Defense Forces (IDF) air strike on an underground missile depot where the explosion was so large it registered on earthquake-monitoring systems. And just a few days ago, Israel claimed it struck at missiles that were being readied to be launched.
But last night the Iranians actually appear to have got off their shots - firing some 20 rockets at Israeli military positions on the Golan Heights.
Israel says it destroyed the launcher from which these were fired. But it then went on to strike at most, if not all, of the Iranian installations it knows about in Syria. The intent: both to set back the development of Iran's military infrastructure in the country, but also clearly to send a powerful signal to Tehran.
In the short term, there is grounds to hope that this will not escalate into an all-out war.
The alleged Iranian attack last night - I say alleged because at this stage there is no confirmation from Iranian sources as to the precise authors of the attack - involved a single and relatively short-range system, what appears to have been a multiple-barrelled rocket launcher.
The targets were Israeli military positions - not civilian areas. Israel's response was massive. But equally, its spokesmen are insisting that they do not want a wider conflict.
Israeli Defence Minister Avigdor Lieberman noted that: "No-one wants an escalation - certainly no-one wants war."
However, Mr Lieberman made it clear that Israel would not, amongst other things, allow sophisticated Iranian air defences to be deployed in Syria which could range over Israeli air-space, effectively closing down aviation there.
Some reports suggest that an earlier Israeli air strike already destroyed Iranian air defences deployed to Syria.