Care to answer my original question? I'm serious, was there some kind of Russia-Iran rift the western media never picked up on that Russian speakers might know of? Is there some kind of Ukraine related situation that is driving Russian actions?
Let me try. Unlike what it might seem, Russia and Iran don’t really have any special or allied relations. There is nothing to do with Ukraine in Russia-Iran relations. They have positive and working relations - this is true. Pretty much the only area they are involved with Iran in is Syria, and Iranian divisions were certainly of a lot of help in Syria on the ground in kicking ISIS into Idlib. Speaking of oil/gas - yes, they are competitors, but I do not think Russia would help sink Iran in order to deprive the latter of their oil/gas market share. Russia also shares EU’s interests in Iran not becoming a nuclear state.
Speaking of media - well, they can always spread something, but smarter politicians don’t necessarily follow those. Initial reaction of media to such events can be any, and I wouldn’t consider it indicative of anything. The reaction of Putin, Trump and even Ukraine’s Zelensky was weighted and calling to get the first results of investigation first. Only Canadian and British PMs gave full freedom to their tongues.
In the rest - Russia’s interests are the same as Europe’s. Primary concern of Russia is stability in the Middle East and terror threat. Terror groups a-la ISIS in the region have plenty of citizens of CIS countries, as well as those of EU countries. Obviously, they are interested in maintaining situation in Iran stable, and the whole Middle East stable and predictable, otherwise Russia and whole Europe will face immense security and terrorism issues. Hence their disapproval of Soleimani’s killing, and careful and weighted reaction to this 737 tragedy. Consequences of Middle East ignition will certainly well outweigh any benefits from a bit greater share of oil markets.