I think we can expect leaders of Muslim societies to cooperate with each other on many issues just as Western societies cooperate with each other.

Fundamentalist tendencies and movements existed, so far as I know, in all societies and civilizations.

Iran of course is Shiite, while the bulk of the Arabs are Sunni, that is a problem or could be a problem. Also, there is the simple fact that Iran is non-Arab and most of the Muslims in the Middle East are Arab.

Islam's borders are bloody and so are its innards. The fundamental problem for the West is not Islamic fundamentalism. It is Islam, a different civilisation whose people are convinced of the superiority of their culture and are obsessed with the inferiority of their power.

As far as ideology or political beliefs are concerned, countries are very different.

Collective will supplants individual whim

Certainly there are various trans-Islamic political movements, which try to appeal to Muslims in all societies.