Taken separately, none of these incidents mean very much but taken together they might be indicative of a new US strategy in Syria: to punish the Russians as much as possible short of an overt US attack on Russian forces.
Best of all, it would be absolutely impossible for the AngloZionist to know who actually shot at them since these weapon systems are mobile and easy to conceal. Just like in Korea, Vietnam or Lebanon, Russian crews could even be sent to operate the Syrian air defense systems and there would be no way for anybody to prove that “the Russians did it” when US and Israeli aircraft would start falling out of the skies. The Russians would enjoy what the CIA calls “plausible deniability”. The US Americans and Israelis would, of course, turn against the weaker party, the Syrians, but that other than feeling good that would not really make a difference on the ground as the Syrians skies would not become safer for US or Israelis air forces.
The other option for the Russians would be to offer upgrades (software and missile) to the existing Syrian air defense systems, especially their road-mobile 2K12 Kub and 9K37 Buk systems. Such upgrades, especially if combined with enough deployed Pantsirs and Verbas would be a nightmare for both the US Americans and the Israelis. The Turks would not care much since they are already basically flying with the full approval of the Russians anyway, and neither would the Iranians who, as far as I know, have no air operations in Syria.
One objection to this plan would be that two can play this game and that there is nothing preventing the USA from sending even more advanced MANPADs to their “good terrorist” allies, but that argument entirely misses the point: if both sides do the same thing, the side which is most dependent on air operations (the USA) stands to lose much more than the side which has the advantage on the ground (the Russians). Furthermore, by sending MANPADs to Syria, the USA is alienating a putative ally, Turkey, whereas if Russia sends MANPADs and other SAMs to Syria the only one who will be complaining will be the Israelis. When that happens, the Russians will have a simple and truthful reply: we did not start this game, your US allies did, you can go and thank them for this mess.