Mr. T-Rex...you better mind your language
Russia and China have ICBMs as deterrent to a US/NATO attack..same goes for US,UK,France...
May I remind you that all of them are economically powerful and have stable governments...
I'll summarize my PoV:
1. We cannot make an ICBM (of 11,000km range) within the given time frame...neither do we have money nor the technological expertise.
2. Even if we start making one now,by the time we have it deployed the Ballistic Missile Defense Technology would be reaching its peak...so it will be of no use.
3. Given the present state of affairs,any intention like that will only worsen our image.
4. In case of an American attack (which is imminent in the next 2-3 yrs), Pakistan Army can easily take out the Military and Airforce bases of US/Nato in Afghanistan with SRBMs.