Azerbaijan is no way a "brutal dictatorship". If someone is a "brutal dictatorship", that is Iran. I will not say Azerbaijan are even democratic, but in no way such word could be accepted.
I already explained that Azerbaijan had independent Khanates prior to Russian invasion, not really part of Iran in reality, only on paper. And don't forget the same Iran during that time had ethnic Azery dynasty ruling the country, of course they considered themselves as rulers of Iran or Persia, but they were ethnic Azeris at the end.
I did not really understand that sentence..."re-join motherland Iran"? Our motherland is Azerbaijan, and if someone should "re-join", that would be Iran because that country were ruled by Azeri dynasties for centuries.
Do you really take such things seriously? Global fire power website is a joke, do you know that?
Iran is a much bigger country and have much bigger military in numbers as you said, but not using such sources.
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Iran itself were made Shia by Azeris and from Azerbaijan. Azerbaijan was already a Shia region when Iran were Sunni.
Please, but please learn history. Azerbaijani influence on Iran are so great that you need to actually study it.