Arms sales to Saudi Arabia increase regional military capability without reliably improving long-term regional stability

What's this about?

People disagree about whether arms sales to Saudi Arabia make the region safer. Weapons can build Saudi power, but they may not bring lasting peace.

What supporters say

• Saudi Arabia bought many war tools, such as jets, air guns, and bombs.
• The war in Yemen shows that more arms can exist with a long war, not peace.
• Arms races can raise fear, as each side buys more weapons to match the other.

What critics say

• Stronger Saudi forces may help guard the country and protect nearby states.
• Saudi weapons may warn rivals not to attack, which could help stop some wars.

How to read this

The number of points on each side does not show who is right; strong proof matters more.

The bottom line

The proof clearly shows that arms sales grew Saudi Arabia’s military power. We’re not sure yet if they bring lasting peace, and the evidence for that benefit looks weak.

The claim is that arms sales to Saudi Arabia have clearly expanded its military capacity, but have not reliably delivered lasting stability across the region. The evidence supports that conclusion in a qualified way: the link between imports and greater resources is strong, while the broader effect on regional stability remains uncertain.

The case for

Saudi Arabia’s access to military resources has grown substantially. SIPRI has repeatedly ranked the country among the world’s largest importers of major conventional weapons, including aircraft, missiles, air-defense systems and other equipment. This supports a clear conclusion about larger inventories and greater available resources, though it does not by itself prove that the equipment was fully operational, effective in combat or successful at deterring rivals 1 (see Figure 1).

The Yemen intervention is the clearest example of why greater military capacity does not necessarily produce lasting stability. Sources link the Saudi-led bombardment and blockade to severe humanitarian consequences, while legal analysis has treated arms transfers as relevant to serious conflict and civilian-harm risks. These sources do not show that arms sales alone caused the intervention or its results. They do, however, show that expanded military resources can coexist with prolonged conflict rather than dependable regional stabilization 2.

Arms purchases can also deepen the competition that helped drive them. Studies of Gulf defense modernization describe acquisitions as responses to regional crises and insecurity. Saudi security literature likewise places procurement within rivalry, deterrence pressures and uncertainty. This can create a security dilemma: one country’s defensive preparations may look threatening to others, leading them to buy more weapons and preserving the conditions that make the region less stable 3 (see Figure 2).

The case against

The main challenge to the claim is that weapons may still improve security in less visible ways. Advanced systems can raise the cost of an attack, reassure allies and help protect territory or critical infrastructure. In that sense, arms sales may strengthen deterrence even if they do not produce a clear, measurable improvement in long-term stability 4.

Saudi purchases are also partly responses to perceived threats. That means regional instability cannot simply be blamed on the transfers themselves. The same weapons may have been intended to prevent escalation, compensate for vulnerability or give Saudi leaders more defensive options 5 (see Figure 3). Their effects depend on how governments use them, how alliances operate and how rivals respond.

There is also an important distinction between equipment and actual military power. Training, leadership, doctrine, organization, maintenance and supplies all affect whether purchased systems work effectively. Equipment totals alone cannot show readiness or battlefield performance. The evidence therefore strongly supports increased potential capacity, but offers a more limited basis for judging actual military effectiveness.

The central problem is causation. Existing sources document imports, modernization, rivalry and the consequences of the Yemen war, but they do not provide a clean comparison showing what regional stability would have looked like without Saudi arms sales. They also offer limited systematic evidence on deterrence, readiness, interoperability with partners and rival responses across different conflicts and time periods.

The bottom line

The evidence favours the claim in its qualified form, but not overwhelmingly on the question of causation. Confidence is high that arms sales increased Saudi Arabia’s material military capacity. Confidence is lower that they directly worsened regional stability, because the surrounding threats, alliances, political choices and conflicts cannot be separated cleanly from the weapons transfers.

The strongest conclusion is therefore that military expansion did not reliably produce long-term stability. Arms sales may sometimes support deterrence or defensive security, but they are not a stand-alone path to peace. Their regional effects depend heavily on political goals, intervention decisions and the reactions of neighboring states.