"South Asia's strategic landscape is characterized by a decades-old and deeply-rooted rivalry between two unequal states, India and Pakistan, which is grounded in history. Their mutual relationship is embedded in a perpetual cycle of hostility in which overt nuclearization of the region has brought a semblance of stability in an otherwise unequal equation. Pakistan is continually faced with a security dilemma emanating from a perceived threat to its existence from a much larger and more resourceful India. This stability is increasingly challenged by existing and projected asymmetries and disparities in conventional forces, fissile material stockpiles, high-technology hardware inductions, missile defences (BMDs), and ballistic missile nuclear submarines (SSBNs). This strategic imbalance is being further aggravated by multi-lateral international support for India's military and nuclear modernization programs while Pakistan continues to be left out. Therefore, the only feasible option available for Pakistan is to increase the credibility of its minimum nuclear deterrent and to rely more on the nuclear option from the menu of available choices."
Naval Postgraduate School (U.S.). Center for Contemporary Conflict: http://www.nps.edu/Academics/Centers/CCC/
US-Pakistan Strategic Partnership: A Track II Dialogue. Phuket, Thailand. September 18-19, 2011