ISLAMABAD, Pakistan  Pakistan is objecting to expanded American combat operations in neighboring Afghanistan, creating new fissures in the alliance with Washington at a critical juncture when thousands of new American forces are arriving in the region.

Pakistani officials have told the Obama administration that the Marines fighting the Taliban in southern Afghanistan will force militants across the border into Pakistan, with the potential to further inflame the troubled province of Baluchistan, according to Pakistani intelligence officials.

Pakistan does not have enough troops to deploy to Baluchistan to take on the Taliban without denuding its border with its archenemy, India, the officials said. Dialogue with the Taliban, not more fighting, is in Pakistan’s national interest, they said.

The Pakistani account made clear that even as the United States recommits troops and other resources to take on a growing Taliban threat, Pakistani officials still consider India their top priority and the Taliban militants a problem that can be negotiated. In the long term, the Taliban in Afghanistan may even remain potential allies for Pakistan, as they were in the past, once the United States leaves.