Is it Immoral?

Jahanshah Rashidian, posted something new in Mideastyouth. The main idea of his new post is this:

• German-Iranian Trade is immoral: Because of totalitarian character of the Islamic Republic of Iran (IRI), trade with it, apart from foods and medical goods, is immoral. it helps the regime to survive and to further tighten its noose round people’s necks.

Here is my comment to this idea:

• As long as you don’t define “morality” properly, this whole debate is flawed.
  Need any example of this Flaw? Clarify your position on China: the people of China are so politically oppressed due to many reports, and many of their basic human rights are denied. But the country is so developing, and many believe that if it were not for the sake of this (oppressing) regime, people would be in a very bad situation. Suppose that a democratically elected regime could never achieve such progress: Now, is it moral to (for example) topple Chinese Government?
  I think this is not so easy to answer. Apply the case to IRI regime. If this regime were successful in economy (which has not been), was it moral to topple the regime?

What do you think?