Here, too, there are nuances... We must also understand "where the legs" of international terrorism come from, who finances, arms and supports them. I can recall - but the concept of bloody terror originated in the USSR in the 1920s, Ulyanov / Lenin was the ideologist, and already at the end of the 50s of the last century, absolutely officially the USSR began to develop "classic terrorism" and develop "fundamental principles", with such decisions like hijacking, hostage taking, bombings in residential areas, sabotage, assassination of foreign leaders, training terrorists for other countries. Just read the history of what terrorism was like until the 60s of the last century, and read what it was actively doing
  USSR in the specified period of time ...
I will give you one sentence. Alexander Sakharovsky, who headed Soviet foreign intelligence at the time, declared: "In today's world, when the nuclear bomb has made the use of military force obsolete, terrorism must become our main weapon"...

Iran, as for me, is just a tool in the hands of other people, like many other terrorist or anti-human regimes and groups. And one thing connects them - they have one "womb of terrorism." I will not say that all world terrorists are a brood of one nest, but the main ones that appeared in the 1960-1970s, yes. And it was they who then "inspired" others to do this ...

PS By the way, I'm almost sure that Iran's support for terrorist Russia is not just like that, not money is of interest to Iran. Most likely, Russia promised to realize Iran's old dream - and help them develop nuclear weapons, supply technology, etc. And this is "management and development of world terrorism"