I dont think any one can stop testing us in long run. Second the power and technology determines the strength of nation not how many units of those. China is not going to attack us just because we have a weapon which is little weaker then theirs, that is not the loss in war is caculated. They know that if attacked we can reply not may be to an extent that they did but futile enough to cause them serious destruction. Leta take a wierd example say tomorrow Sri Lanka posses a Nuclear enough to destruct Chennai, would we attack them even if we have a Nuc enough to erode all of Lanka?