Why do they need to bitch each other all the time? Iran will not bomb Israel, even if they can build some crude nuke and dance around it (otherwise they can dance around the Tehran funeral pyre of Persia). Saudi Arabia will not try a replay of Iraq's game of conquering the oilfields of Iran and Iran is in no position to attack Saudi Arabia that is an upper medium level power approaching the military level of a great power in hardware imports.
The whole conflict must be seen from an internal conflict distraction perspective and internal problems are available in heaps in all countries of this region. Our newspapers just don't report much on the problems of the average hard working Israeli, Persian or Arab to pay for all this conflict and still buy food and clothes for a family. The Arab Spring just happened and spread for these very reasons and the whole nuke story is captivating, but distracting from the problems at their doorsteps which are due to hideous exploitation by their local elite networks doing "business".
So what for is this 5th generation fighter serving as a smokescreen? What better weapon system, what better ego boost?