I would also suspect that Russia has very few qualified carrier pilots.Also noticeable is the comparatively small size of the airgroup that can be seen on the flightdeck. There may, of course, be more aircraft in the hangar but I suspect that the total airgroup that can be efficiently operated is only around 20/25, quite small considering the size of the ship. This would reinforce the comments made by several posters concerning the inefficiency of STOBAR operations.
The Med cruise (even if short) was the first in many years and no doubt it was important to be in the worldwide news to make a statement. Any accidents or incidents on this cruise would have been catastrophic.
Of other importance internally, it would boost the morale of the Russian Navy which has not been the blue water force it was since the Cold War and break-up of the USSR.