It's not even necessary that the shipyard be destroyed, just that the countries they're based in need shipyard output more than they need to honor their agreeme

It's not even necessary that the shipyard be destroyed, just that the countries they're based in need shipyard output more than they need to honor their agreements with us. Sourcing foreign ships for domestic use may be a good idea, but production-sharing agreements like that are worthless when it really matters. If you don't have physical possession of the productive capital (legal possession can be, and is, ignored when shit hits the fan, so that hardly matters) then you can't count on it in a crisis.