"The speculation doing the rounds in media regarding China's protest over NSG membership to India is not true," he said on the sidelines of a function here.
Singh's remarks came a day after China accused the US of ignoring facts over India not getting entry into the NSG and claimed that the plenary meeting of the elite grouping in Seoul did not discuss the accession of any specific country.
Singh said the NSG meeting was held behind closed doors.
"Whether China had opposed India's bid or not could be told only by those present in the closed-door meeting," he said.
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Singh said deliberations held behind closed doors could not be made public and added that India has been trying for NSG membership since 2008.
On a query about relations with neighbouring countries, he said India was making continuous efforts in this direction.
Regarding Pakistan, he said relations improve through talks, therefore, instead of negative approach, India maintains a positive gesture.
Singh said in Pakistan, army, terrorist organisations and the government were running their own system.
"It is not clear, who is running the government in Pakistan. We can talk to the elected government, therefore our positive approach is not giving expected results," he said.
On whether India's stand towards Pakistan was soft, he said New Delhi was doing whatever was necessary and expected.