"India has the disadvantage of being situated in close proximity to what has been described as the epicentre of global terrorism. We have seen the effect of it in the last decade or two," Singh said.
"In my view, Pakistan will continue to remain a principal national security challenge in the short term," he said.
With regards to the challenges from China, the Lieutenant Governor said the massive infrastructure projects being set up by Beijing in Tibet may pose security challenge in the long term for New Delhi.
"We also cannot ignore the massive development of infrastructure in Tibet Autonomous Region (by China) and the related deployment capability of PLA (People's Liberation Army).
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China, therefore, in my view, remains a long-term challenge for our national security. I don't use the word threat but it is a challenge," he maintained.
He said the strategy towards Pakistan should be devised in such a way that Indian Government and people are taken on board on developing closer bilateral ties.