"The recent election in Pakistan, as well as the normalising of US-Pakistan relations, are necessary but not sufficient conditions for the regularising of India-Pakistan relations," noted American scholar Stephen P Cohen has said.
"Nawaz Sharif may have his heart in the right place, but there may be more resistance in India than he expects; this would be tragic, but perhaps likely," Cohen said.
"Also welcome are the growth of trade, and other ties, but the opposition to normal relations in both countries, perhaps more in India now than Pakistan, is still substantial," said Cohen during the release of his latest book, "Shooting a Century: The India Pakistan Conundrum", which hit the book stores this week.
The US, he said, needs a strategy that sees India-Pakistan as a whole.
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"While the 'de-hyphenation' was important, it led America away from creative ideas about how these two powers can be aided as they seek normal relations: these are not trivial countries, India will be the world's most populous state, Pakistan will be the world's fourth largest, and both have active and growing nuclear weapons programmes aimed at each other," he argued.
In his latest book, his 15th so far, Cohen argues for a collaboration between India and Pakistan in Afghanistan.
He also recommends a civilian nuclear deal with Pakistan on the lines of that with India, so as to recognise Pakistan as a nuclear power.
"Washington went part way down this road when it entered into a civilian nuclear deal with India that legitimised New Delhi's nuclear status; it should find a formula that does the same for Pakistan, with the caveat that being a full member of the nuclear club means that Pakistan and India must assume the obligations set forth for nuclear weapons states under the Nuclear Nonproliferation Treaty (NPT)," Cohen wrote.
"This is a far more realistic goal than chimerical demands that India and Pakistan disarm and sign the NPT as non-nuclear weapons states," he said.