When Dubya got elected in 2000, the United States made the decision to pursue a program of the weaponisation of space, to our benefit. America withdrew from both the Space Treaty and an ABM Treaty in order to pursue both a missle defence shield and satellite military platforms. Is it so surprising that this threatened dominance of Earth's orbital space has provoked a response by another major power?

Reverse the argument. Suppose it had been China that had abrograted those treaties and was working on a system that would allow them to strike with nuclear missles while being able to stop most of the counter-strike from the United States. Don't you think we would have been loud in our condemnation and quick to develop or expand satellite-killing missles and/or satellites?

I don't think the timing has anything to do with the Iranian situation at all. It was just time to try the missle out (it's called testing). While this is not good news for the United States, it should hardly be unexpected or something to panic over (apart from whomever runs the ABM Defence program).