Talks between the top security advisers of neighbors and archrivals India and Pakistan have hit several roadblocks over the contentious Kashmir region before they've even started.

Pakistan's Sartaz Aziz is scheduled to arrive in New Delhi to meet India's national security adviser Ajit Doval on Sunday. It comes as both countries upped their rhetoric over the disputed region of Kashmir.

On Friday, India said that it would not be "appropriate" for Aziz to meet with Indian Kashmir's separatist leaders. Pakistan's high commissioner to New Delhi had invited those leaders for a meeting with Aziz. On Thursday, some separatist leaders were briefly detained and then released.

Pakistan on Thursday canceled an upcoming conference of lawmakers from Commonwealth countries after India demanded that legislators from Indian-held Kashmir also be included.