On 17 September 2025 Islamabad and Riyadh signed a “Strategic Mutual Defense Agreement” declaring that “any aggression against either country shall be considered an aggression against both” — a bilateral pledge whose timing and implications reverberate across the Middle East and South Asia. Ministry of Foreign Affairs Pakistan+1
— محمد بن سلمان بن عبد العزيز (Informal) (@HRHMBNSALMAAN) September 17, 2025
What the pact says — in plain terms
Pakistan’s prime minister and Saudi Arabia’s crown prince signed the formal document — titled in the Pakistani joint statement as
“This agreement, which reflects the shared commitment of both nations to enhance their security and to achieving security and peace in the region and the world, aims to develop aspects of defense cooperation between the two countries and strengthen joint deterrence against any aggression,”
سعودیہ اور پاکستان۔۔
جارح کے مقابل ایک ہی صف میں۔۔
ہمیشہ اور ابد تک۔🇵🇰🇸🇦 https://t.co/3oBMFEU1G5— Khalid bin Salman خالد بن سلمان (@kbsalsaud) September 17, 2025
“ The agreement states that any aggression against either country shall be considered an aggression against both,”.
This wording is straightforward but also consequential: the legal text converts political solidarity into a formal security commitment. In practice it creates a standing expectation that a serious external aggression against Pakistan or Saudi Arabia will elicit some form of reciprocal assistance from the other side — military, logistic, intelligence, diplomatic or a mix depending on circumstances. Reuters and other international outlets report that the pact institutionalises decades of informal security ties. Reuters+1
Why the press-release wording matters:
The phrase “shall be considered an aggression against both” is the core clause. It mirrors the language used in classic collective-defence treaties — it creates political and diplomatic obligations and a powerful deterrent signal even if the pact does not immediately establish NATO-style integrated command structures. Ministry of Foreign Affairs Pakistan
How this differs from big alliances such as NATO
At the level of principle, Pakistan–Saudi wording echoes the collective-defence idea found in NATO’s Article 5 — that an attack on one is an attack on all. NATO is a multilateral alliance with permanent command arrangements, joint force planning and decades of interoperability; it counts 32 member states and a formal Article 5 invocation mechanism. Bilateral pacts (two countries) rarely replicate those institutional layers. NATO+1
The Pakistan–Saudi agreement is therefore NATO-like in spirit (mutual protection, deterrence) but not NATO-like in structure: it is a bilateral political-military commitment that formalises existing cooperation rather than creating an integrated military bloc with standing multinational commands. International coverage has stressed this distinction while also noting the pact’s symbolic and deterrent power. Financial Times+1
So, “similar in spirit” means the security promise is mutual and reciprocal; “different in structure” means there is no publicly announced permanent joint command, no automatic mobilisation roster like NATO’s, and no multilateral decision machinery made public in the pact text. Reuters
Has Pakistan signed similar pacts before?
Yes — Pakistan has a history of formal and informal defence commitments. In the 1950s, Islamabad entered into the U.S.–Pakistan Mutual Defense Assistance Agreement (1954) and joined Cold War security pacts, such as SEATO and the Baghdad Pact (later CENTO). These arrangements tied Pakistan to Western collective-defense structures in return for military aid. Those Cold War groupings later dissolved or became obsolete, but they are important precedents for Pakistan’s use of formal security agreements. Foreign Affairs+1
Since then Pakistan has developed long-standing bilateral defence partnerships — most notably deep defence and strategic cooperation with China — but Beijing and Islamabad have not published a formal mutual-defence treaty analogous to NATO’s Article 5. Likewise, Pakistan’s security relationship with Saudi Arabia has for decades included training, arms transfers and the secondment of Pakistani officers to Saudi units; the 2025 pact represents an institutionalisation of those ties into an explicit mutual-defence guarantee. Wikipedia+1
In short, Pakistan has been party to formal collective-defence agreements in the past and maintains many defence relationships today — but the 2025 pact with Saudi Arabia is the most explicit mutual-defence guarantee between Pakistan and any Gulf state in recent memory. Reuters+1
Why the timing matters — the Doha strike and regional shockwaves
Context matters: the agreement was signed days after an unprecedented Israeli strike on Doha (9 September 2025) that targeted Hamas political leaders and sent shockwaves through the Gulf. That attack prompted immediate condemnations, raised questions about the inviolability of Gulf airspace and accelerated ally-seeking behaviour among regional states that fear cross-border strikes and a decline in confidence in traditional security guarantors. International reporting links Riyadh’s move to diversify and deepen security partnerships amid those worries. Reuters+1
Put bluntly: Riyadh and Islamabad signed the pact during a period of heightened uncertainty about regional security — a moment when Gulf capitals are weighing whether existing security umbrellas are adequate and whether new, more direct guarantees (even outside of the U.S. framework) are needed. Analysts see the pact as both deterrent signalling and practical hedging. Financial Times+1
How many states and pacts like this exist?
There is no single global tally that counts every bilateral mutual-defence treaty, because such agreements range from multilateral alliances to two-party treaties and many are confidential in part. However, a useful way to gauge scale: multilateral alliances such as NATO (32 members) and treaty blocs during the Cold War are well documented; the United States alone is party to a network of bilateral collective-defence treaties (with Japan, South Korea, Philippines, Thailand, Australia, New Zealand and several NATO members among them), listed in U.S. State Department records. Beyond those, dozens of bilateral and regional defence pacts exist worldwide in various forms. NATO+1
Deeply touched by the heart warming welcome, accorded to me by my dear brother HRH Prince Mohammed bin Salman, Crown Prince and Prime Minister of Saudi Arabia, on my official visit to Riyadh.
From the unprecedented escort provided to my aircraft by the Royal Saudi airforce jets… pic.twitter.com/RZvkOSQbF1
— Shehbaz Sharif (@CMShehbaz) September 18, 2025
Examples that illustrate variety:
- NATO (multilateral, Article 5) — highest institutionalisation and multilateral commitment. NATO
- U.S.–South Korea Mutual Defence Treaty (1953) — bilateral but long-standing, operationalised by US troop presence. U.S. Department of State
- France–Greece (2021) and other newer bilateral pacts — show that modern European states also use bilateral defence guarantees to manage regional risks. Financial Times
What this pact can (and cannot)
What it can deliver: a clear political deterrent, deeper intelligence and logistics cooperation, joint exercises, and reciprocal diplomatic support. It raises the military and political cost for any actor contemplating direct aggression against either country. For Saudi Arabia it brings an additional security partner with Pakistan’s military experience; for Pakistan it reinforces ties with a wealthy Gulf state and expands its strategic footprint.. Ministry of Foreign Affairs Pakistan+1
What is expected to develop further through cooperation: detailed operational frameworks, command structures, and military protocols. Like many new defence agreements, the 2025 pact lays out the principle of joint defence and establishes the political commitment; the finer points of implementation will evolve through follow-on military coordination and exercises. Analysts note this is common in bilateral defence treaties, where practical arrangements are gradually built up over time.. Reuters+1
The Pakistan–Saudi Strategic Mutual Defense Agreement of 17 September 2025 is a high-visibility, reciprocal security pledge that formalises decades of cooperation. It is NATO-like in principle — it promises mutual protection — but bilateral in structure. Signed in the immediate aftermath of an unprecedented strike in Doha, the pact is both a deterrent signal and a tactical pivot by Riyadh and Islamabad to deepen mutual security guarantees at a fragile moment in the region. Ministry of Foreign Affairs Pakistan+1