The US and Taiwan are quietly building a "Hellscape" defense plan to flood the Taiwan Strait with AI-guided drone swarms, a move that raises the cost of a Chinese invasion but faces big political and supply hurdles.

• The plan, begun under Biden, would use huge numbers of cheap drones with onboard AI to find and hit Chinese warships even if China jams communications.
• The goal is not to stop an invasion outright but to make it slow and painful, buying time for US forces to arrive.
• Trump is a wild card: he treats arms sales to Taiwan as a bargaining chip with Beijing and has not approved a pending $14 billion package.
• US weapons stocks were drained by the Iran war and could take years to rebuild, which may delay deliveries already promised to Taiwan.
• Taiwan's own drone production is too small, and government purchase plans are stuck in budget fights.

Some worry Beijing could strike around the 2028 Taiwan election while US readiness is low. Still, lessons from Ukraine and the Middle East suggest defenders now have the edge — an attacker may need 20 to 30 times the defender's firepower, up from the old rule of 3. China's military has taken notice and is rewriting its Taiwan war plans and buying more anti-drone ship defenses.

Outlook: The plan's success hinges on whether Washington approves arms sales and Taiwan can ramp up drone output before China feels confident enough to move.