TAIPEI: A colorful Taiwanese tycoon on Thursday unveiled plans to train more than three million "civilian warriors" to help defend the East Asian island in case of a Chinese invasion, donating TW$1 billion ($33 million) of his own money.

Robert Tsao, 75, is one of Taiwan's most successful businessmen and the founder of major microchip maker United Microelectronics Corp. (UMC).

He has been increasingly outspoken against Beijing, and his donation comes after China's forces put on a huge show of force to protest United States House Speaker Nancy Pelosi's visit to Taipei last month.

Taiwan lives under constant threat of invasion by China, which claims the self-ruling island as part of its territory to be seized one day, by force if necessary.

For a week after Pelosi's visit, China sent warships, missiles and fighter jets into the waters and skies around Taiwan, its largest and most aggressive exercises since the mid-1990s.

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Tsao warned it would be "an intentional slaughter and vicious war crime and crime against humanity" if China were to use force against Taiwan.

The tycoon said he would put TW$600 million toward training three million "black bear warriors" in the next three years who could work alongside the military.

Another TW$400 million will be used to train 300,000 "marksmen" with shooting skills.

Tsao, who no longer holds any position or title with UMC, portrayed the risk posed by China as existential.

"The Chinese Communist Party's threat to Taiwan is growing and the fight against [it] stands for freedom against slavery, democracy against authoritarianism and civilized against barbaric," he said.

"If we can successfully resist China's ambitions, we [would] not only be able to safeguard our homeland, but [also] make a big contribution to the world situation and the development of civilization."

Taiwan has spent decades living alongside Beijing's threats, but the saber-rattling has become more pronounced under President Xi Jinping.

China's most authoritarian leader in a generation, Xi is on the cusp of securing an unprecedented third term later this year and has made gaining Taiwan a key part of his "national rejuvenation" goals.

Taiwan remains massively outgunned, with 88,000 ground forces compared to China's one million troops, according to Pentagon estimates.

Mandatory military service for Taiwanese men is currently just four months.

American and Taiwanese strategists have increasingly pushed Taipei to adopt a "porcupine" strategy of asymmetric warfare, which would include training civilians to fight.

Russia's stalled invasion of Ukraine has also focused attention in Taiwan on both the threats posed by a giant authoritarian neighbor, and how huge armies can be resisted by a much smaller, but determined defender.