In a programme organised by the think tank Atlantic Council in Washington, Mushahid Hussain Syed said, "We (Pakistan) are observing a change in US diplomatic policy".
Hussain said "every action has a reaction, and Pakistan felt the need to develop close ties with Russia after President Barack Obama's two visits to India.
"This was the start of a new chapter in Pakistan-Russia ties," Hussain was quoted as saying by Dawn News.
He said the US State Department had refused to give visa to then Gujarat Chief Minister Narendra Modi in 2006, but when Modi was elected as Prime Minister, the US changed its policy for "political gains".
"This U-turn of US policy can be traced back to the time of Bush administration, when the US-India nuclear deal was signed which was against the law of non-proliferation of nuclear weapons," said Hussain.
He also said that violating Indus Waters Treaty will be an "act of war".
"Apart from Pakistan and India, the World Bank is also a stakeholder in the treaty," said Hussain.
Commenting on the Uri attack in Jammu and Kashmir, Husain said, "UN military observer group for India and Pakistan should investigate the Uri attack. Crossing the Line of Control to attack any target in India is not possible for any militant."
A contingent of Russian ground forces arrived in Pakistan earlier in September for the first ever joint Pak-Russian military exercise.
The two-week-long exercise is expected to continue until October 10. Around 200 military personnel of both countries will participate in the drills.
The exercises with Russian ground forces came amid rising tensions between India and Pakistan.
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