US also wants both the prime ministers to hold bilateral talks to ease tension.
"US has been working "really hard" to advance a "rapprochement" between Islamabad and New Delhi," said US Secretary of State John Kerry, reported Dawn online.
"We encourage that. I think it's required to encourage both leaders to engage in the dialogue that they've engaged in. And needless to say, we don't want to do things that upset the balance. But we do believe that Pakistan is engaged legitimately in a very tough fight against identifiable terrorists in their country that threaten Pakistan," he argued.
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A Pakistani delegation reached US on Sunday for a strategic dialogue that seeks to enhance Islamabad's relations with Washington.