Pakistanis claim India is an external threat to Pakistan. But why? Do Pakistanis feel that India has never been reconciled to Partition and the creation of Pakistan and seeks to reunify Pakistan with India by force? Not so! says Air Vice-Marshal (Ret'd) Abid Rao of the Pakistan Air Force. He maintains that even if Pakistan were to ask India to reincorporate Pakistan into India, the Indians would refuse. If this is true, why is India used as a bogey man in Pakistan? For what purpose is this done?
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For that to be genuine question, you should have done some work or should have had a glimpse at history.
First of all division of India was agreed by the Congress party so there is politically imbedded intention or ambition to take back those territories.
The territories which form part of Pakistan had been only historically part of India long time back. Very few people in India desire to have those territories with present day conditions and populations.
Pakistan territory has only one geostrategic importance that it provides one a link to Afghanistan before one can reach energy rich CAR. In todays global environment, one can reach CAR from many sides - from China, From Tibet, From Russia, From Iran, From Turkey etc. If India can import oil from Latin America, they can import gas and oil from CAR from alternate sources.
Pakistan territory is not in any way strategically mineral rich territory with abundance of oil, gas , minerals or other vital strategic products. Capturing that territory and annexing it with India does not give any advantage. On the contrary, disadvantages of managing that burgeoning jihadi population are too many.
In 1948, it is Pakistan that invaded J&K and captured Indian territory. India has till now not taken back that territory. And it appears Indians are not keen to take back territory which they could have easily done in 1971.
It is Pakistan that invaded India in 1965 to Capture Indian Territory not India. India returned to Pakistan all important territory captured by Indian Forces.
The Siachin dispute between the two countries is a matter of Strategic nature rather than territorial. It is meant to deny a junction between China and Pakistan in a vital area.
Sir creek dispute is very minor in nature and is more of an ego problem rather than any territorial problem.
India liberated Bangladesh but did not keep it - the objective was not territory...
Territory is ingrained in Pakistan Mogul mind set who consider India as their fathers property and wish to rule from Delhi once again. That mind set which was responsible for creation of Pakistan still exists and shall continue to exist.
For India the only matter regarding territory is to protect their territory against that Pakistani mind set.