European rearmament increasingly depends on production networks that do not coincide with national borders, and the Nordic countries present one of the continent’s strongest cases for such specialisation. Defence authorities there procure jointly, firms operate across several jurisdictions, ammunition capacity is being expanded with national and European money, and governments have committed themselves to deeper cooperation on security of supply. Yet the strategic value of a production line situated in another European state is not settled by geography or political alignment. It depends on whether the purchasing state can still obtain the relevant output when demand rises everywhere at once, national priorities harden, licences become restrictive, contracts meet force-majeure conditions and industrial bottlenecks prevent every customer from being served. The question for European strategic autonomy is therefore not whether Nordic cooperation exists, but when cross-border industrial capacity can prudently be treated as accessible capacity — and the answer turns out to be legible, instrument by instrument, in the public record.