Security cooperation that produces no economic return does not survive a change of government. This is not cynicism about allies; it is an observation about how democracies and monarchies alike allocate attention. An agreement that delivers capability but no visible domestic benefit becomes, within a cycle or two, a line item defended by officials rather than a relationship defended by leaders. The ones that endure are those where the security logic and the economic logic point the same way.
That is why offsets, localization and industrial participation are not concessions extracted at the end of a defense negotiation. They are the mechanism by which the agreement acquires a domestic constituency, and therefore the mechanism by which it lasts.
Localization only works if it produces a real capability
Most localization programs fail in a predictable way. A facility is built, a ribbon is cut, and the plant performs final assembly on imported components for a single customer at a volume too low to be viable. The employment figures are real for a few years. The capability is not, because nothing has been transferred that the country could use if the original supplier withdrew.
The programs that work select for a narrower thing: a segment where the country has a genuine advantage, energy cost, geography, an existing skills base, and build depth there rather than breadth everywhere. Maintenance and overhaul is often a better first step than manufacture, because the demand is continuous, the skills transfer is real, and it earns the country a position in someone else's supply chain rather than an isolated plant.
An agreement with no domestic constituency is defended by officials. One with a domestic constituency is defended by leaders.
Sequencing decides the outcome
The common error is to negotiate the security arrangement first and attach the economic component afterwards, when the leverage is gone and the terms are set. By that point the industrial participation is priced as a discount rather than designed as a capability, and the supplier has every incentive to satisfy the letter of the requirement at the lowest cost to itself.
Designing both together is harder and slower. It requires the defense ministry and the economy ministry to agree on what the country is trying to become, which is not a conversation either is structured to have. It also requires accepting a smaller headline number in exchange for a deeper one, a trade that is difficult to explain publicly and almost always correct.
Prosperity as the durable part of the relationship
Over a long enough horizon, the economic relationship is what carries the security one through the periods when the security rationale is contested. Trade, shared industry and people who have worked together for a decade are not a substitute for a treaty. They are what makes the treaty survive an administration that did not sign it.
For a sovereign partner, the practical test is simple enough to apply to any proposal on the table: in ten years, if the security case were re-argued from scratch, who inside the country would argue for it, and what would they be protecting?