Afghanistan

• Deep historical, ethnic (Pashtun), and religious ties; but relationship troubled by Durand Line dispute (Afghanistan has never formally recognized it)
• Decades of hosting Afghan refugees (since 1979 Soviet invasion) — among world's largest protracted refugee situations
• Post-2021 Taliban takeover — Pakistan initially hopeful, now strained over TTP safe havens, trade route closures, deportation of Afghan refugees (2023 onward)

China

• "All-weather strategic cooperative partnership" — closest, most stable bilateral relationship
• CPEC (China-Pakistan Economic Corridor, launched 2015, ~$62bn) — flagship BRI project: infrastructure, energy, Gwadar port
• Security cooperation — joint military exercises, defence equipment (JF-17 Thunder jointly developed)
• Concerns: debt sustainability, security of Chinese nationals working on CPEC (targeted by BLA attacks)

Iran

• Shared border (Balochistan), cultural/religious ties (though sectarian friction exists)
• Tensions over cross-border militancy — mutual accusations of harboring militants; brief Jan 2024 tit-for-tat airstrikes (Pakistan-Iran) — quickly de-escalated diplomatically
• Economic cooperation limited by US sanctions on Iran (constrains gas pipeline project — IP gas pipeline stalled for years)

Central Asian Republics

• Growing interest in connectivity (CASA-1000 electricity project, TAPI gas pipeline — both stalled/slow due to Afghan instability)
• Limited direct trade so far; Afghanistan as the missing link

Exam angle

Each neighbor relationship has a distinct "tension point" — Afghanistan (Durand Line/TTP), China (debt/security), Iran (sectarian/US sanctions) — examiners like naming these explicitly.