Pakistan's participation in the International Military Education and Training Programme (IMET) will strengthen working relations between the military leaders of both countries, say observers.
Videos, photos and circumstantial evidence clearly suggest the plane was struck by a surface-to-air missile, but Iranian officials continue to deny the possibility.
Leaders described Tehran's missile attacks as dangerous and urged dialogue to prevent further escalation.
All member nations had repeated their long-standing concerns about Iran's destabilising activities in the Middle East, said NATO chief Jens Stoltenberg.
Britain, France and Germany are backing the United States in its growing confrontation with Tehran, as new details have emerged about Gen. Qasem Soleimani's plots to kill Americans.
Despite repeated warnings, Iran and its proxies have launched numerous attacks against US personnel and its allies for nearly a year. The attack on the US embassy was the last straw.
The decision to unfreeze security aid is a sign of thawing relations between Washington and Islamabad.
Nangarhar residents are enjoying a return to peace in the region after ISIS was ousted through a joint effort of public uprising forces and government troops.
Punjab Province, once afflicted by sectarian violence, has not seen a single terrorism incident involving sectarianism over the past three years, a security official said.
Officials say Tehran backs Sipah-e-Muhammad Pakistan, Sipah-e-Sahaba Pakistan, Zainabiyoun Brigade and other Shia groups in a bid to extend Iranian influence in the region.