State‑mandated cybersecurity vendor substitution

A durable policy tool: states can order domestic firms to stop using specified foreign cybersecurity products and compel replacement with local alternatives. That accelerates software autarky, fragments defensive interoperability, concentrates risk in new domestic vendors, and forces allied governments to choose between reciprocal restrictions, bilateral negotiation, or accelerated indigenous capacity building. — If used widely, regulatory substitution of cybersecurity vendors will recast supply‑chain security, force new export‑control and procurement responses, and make national cyber defenses more politically brittle and regionally divergent.