An ICBM is and of itself an offensive weapon. It is used to decimate infrastructures. Its only defensive property is in the MAD, Mutally Assured Destruction idea, hardly a reassuring thought. A Patriot missile is a defensive weapon. A SCUD is offensive. A SAM is a defensive weapon. A Maverick is offensive.
We can do this all day...
Now, Chi-Can, if, as you claim in your other post on another thread, China is "all about doing business" and making money why is it that they need nuclear missiles in order to be taken seriously? Japan does not have any nuclear capability and the entire world takes them seriously.