The cross-border movement of militants to and from Afghanistan has strained Pakistani-US relations in recent years.
'Pakistan has an important role to play' in the Afghan peace process, said US envoy Alice Wells.
The improvement of ties between Moscow and Islamabad will jeopardise Pakistan's relations with the rest of the world, analysts say.
The Afghanistan-Pakistan Action Plan for Peace and Solidarity (APAPPS) sets the framework to strengthen relations, particularly on mutual security and economic issues, observers say.
A unified front and stronger relations are necessary to fight terrorism and bring sustainable peace to the region, analysts on both sides of the border say.
By skipping a Tashkent summit on Afghanistan, the Taliban might have hurt their own cause, observers and participants say.
Despite what Iranian Foreign Minister Mohammad Javad Zarif said during his recent visit, Iran's increasing aggression is fostering mistrust between the two neighbouring countries.
From co-ordinating Taliban attacks against Pakistani interests to radicalising innocent Pakistani Shia, Iranian Foreign Minister Zarif has much to explain about Iran's mounting aggression.
Tehran remains silent after allegedly ordering an attack on an event attended by Pakistani Prime Minister Shahid Khaqan Abbasi in Afghanistan.
Pakistani Army Chief of Staff Gen. Qamar Javed Bajwa met with Afghan President Ashraf Ghani in Kabul to discuss regional security and counter-terrorism co-operation.