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U.S. officials have offered key concessions to Pakistan in a bid to save the CIA’s drone campaign in the country, including giving the Pakistanis advance notice of a strike and limiting the types of targets. But the offers were flatly rejected, said U.S. and Pakistani officials.

The drone attacks are very unpopular in Pakistan because many people believe they mostly kill civilians, an allegation denied by the U.S.

Pakistani officials repeatedly have criticized the attacks as a violation of the country’s sovereignty, but the government has helped with some of the strikes in the past. That cooperation has come under serious strain as the relationship between the two countries has deteriorated.

Mr. Obama met with Pakistani Prime Minister Yousuf Raza Gilani on the sidelines of a nuclear summit in Seoul on Tuesday. He said the U.S. and Pakistan are seeking a balanced partnership that respects Pakistan‘s sovereignty “but also respects our concerns with respect to our national security and our needs to battle terrorists who have targeted us in the past.”