The “red things” are inlet covers. They keep stuff out of the intakes. They are mostly used on fighter type aircraft. Same same for the one on the exhauset.
Ummmm ...
Yes. I got that.
The other fellow seemed to think that the "engine inlets" were on the bottom of the "aircraft".
As you can see, I strongly suspect that thing of being a stage-prop.
And yes, I get your point about the Iranians being able to operate aircraft. That's a different skill set and a different industrial and engineering base from designing and building aircraft.
I’ve seen Russian planes on disused ramps and runways that are so overgrown with weeds and crap, that they don’t even bother with “inlet protection”...they make their engines to eat FOD....