The BBC's Chris Morris in Islamabad says that cross-border co-operation was high on the agenda when Mr Zardari and Mr Bush met at the UN.

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Top of the agenda was a meeting of the Shanghai Co-operation Organisation, a group that includes Central Asian nations.

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Also on the agenda will be Belgrade's level of co-operation with the International War Crimes Tribunal at the Hague and regional issues in southern Serbia, Kosovo and Montenegro.

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