Sinha, a former External Affairs Minister, said India could have taken a path different from the G+4 and need not have pursued the grouping with the "vigour" with which it is doing now.
Modi made a "mistake" by continuing with UPA's strategy of relying on G-4, Sinha said adding that it was one thing to align with developing countries and another to include two developed countries - Germany and Japan--in this group.
"We need not have pursued the G4 with the vigour with which we are doing," Sinha told Karan Thapar on India Today TV when asked if this was a foriegn policy mistake on India's part.
He said that it was India's mistake not to join the global coalition against terror group ISIS and the United States and P5 + 1 group's efforts to contain Iran's nuclear programme.
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"They are doing permanant damage to our civilisational heritage. They are killing people in the most brutal manner. In the 21st century, we should not be sitting down and looking at it as bystander. We should be in it as thickly as possible," Sinha said.
Making a strong pitch for delinking terrorism from religion, Prime Minister Narendra Modi during his ongoing trip to US asserted that a global response was required to effectively combat international terrorism propagated by outfits like Islamic State (IS).