Taiwan's foreign minister Lin Chia-lung is pushing Japan to treat the first island chain as one connected battlefield rather than separate national defense zones — a sign of tightening democratic alignment against China, and a warning shot for Beijing.

• Taiwan wants shared warning systems and joint resilience across the island chain, not piecemeal defense by each country.
• Cooperation is being framed to start with safer ground — disaster relief and emergency response — before touching sensitive military work.
• Economic security is being treated as national security, with Taiwan and Japan pairing their industrial strengths.
• TSMC's Kumamoto plant in Japan is held up as the model for a "non-red" supply chain that keeps China out.
• The same playbook is now moving from chips to drones, with Taiwanese and Japanese drone groups signing a cooperation deal in July to build a supply chain free of security risks.

Outlook: Expect more Taiwan–Japan industrial tie-ups in drones and chips, plus more unofficial lawmaker and think-tank diplomacy, as both sides build trust without formal ties.