The Economist explains

What is Taiwan’s porcupine defence strategy?

Russia’s invasion of Ukraine raises questions about how Taiwan could fend off China

This photo taken on October 20, 2020 shows anti-landing spikes placed along the coast of Taiwan's Kinmen islands, which lie just 3.2 kms (two miles) from the mainland China coast (in background) in the Taiwan Strait. - The tank traps on the beaches of Kinmen Island are a stark reminder that Taiwan lives under the constant threat of a Chinese invasion -- and fears of a conflict breaking out are now at their highest in decades. (Photo by Sam Yeh / AFP) / TO GO WITH Taiwan-China-US-politics-military-Kinmen,FOCUS by Amber WANG and Jerome TAYLOR (Photo by SAM YEH/AFP via Getty Images)

THE THREAT of Chinese invasion has loomed over Taiwan for more than 70 years—so long that many Taiwanese have grown to assume it will never happen. Russia’s invasion of Ukraine shattered that complacency. Taiwan suddenly has a live example of a large state invading a smaller neighbour while claiming that it is not a real country—the same claim China makes about Taiwan. The disturbing parallel has sparked a public debate over whether Taiwan is prepared to fend off an invasion. One recurring topic is the “porcupine” method of defence that American and Taiwanese strategists have pushed Taiwan’s armed forces to adopt. What does it mean to be a porcupine, and how might it help deter Chinese aggression?

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