"The world's attention has rightly been riveted on negotiations aimed at curbing Iran's nuclear programme. If and when that deal is made final, America and the other major powers that worked on it - China, Russia, Britain, France and Germany - should turn their attention to South Asia, a troubled region with growing nuclear risks of its own," The New York Times said in an editorial.
The editorial said Pakistan is "hardly alone in its potential to cause regional instability," with China continuing to build up its nuclear arsenal, now estimated at 250 weapons.
Calling Pakistan as "unquestionably the biggest concern" in the region, the editorial said continuous investments by the country in military arsenal capable of carrying nuclear warheads "reflect the Pakistani Army's continuing obsession with India as the enemy, a rationale that allows the generals to maintain maximum power over the government and demand maximum national resources.
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On India's part, which has a nuclear arsenal of 110 weapons compared to Pakistan's 120, Prime Minister Narendra Modi has made it clear that Islamabad can expect retaliation if Islamic militants carry out a terrorist attack in India, as happened with the 2008 attack in Mumbai, the editorial said.
The two countries have a "troubled history" and deep animosities persist, it said adding that since the last major conflict in 1999, India has focused on becoming a regional economic and political power.
"Pakistan has left open the possibility that it could be the first to use nuclear weapons in a confrontation, even one that began with conventional arms. Adding short-range tactical nuclear weapons that can hit their targets quickly compounds the danger," the editorial said.
It added that billions of dollars have been "wasted" by Pakistan on acquiring sophisticated defence systems that otherwise should have been spent on health, education and jobs for its people.