Han identified the lack of security sense by some government officials as one of the main causes for leaks to foreigners.
"Some high-ranking government officials love to answer questions from their foreign friends. They answer every question they are asked and will offer information that was not asked of them," he said.
He singled out 10 countries as the most active in collecting information on Taiwan. They include the US, Japan, England, France, Germany, Singapore, Russia, New Zealand, Australia and South Korea.
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