A lieutenant colonel surnamed Hsiao, based in the army's Aviation and Special Forces Command, had been detained on suspicion of leaking defense secrets to "foreign forces including China."
Tan said Japan's annual defense paper projected a "wrong perception" of China, and "deliberately exaggerates the so-called Chinese military threat."
A weekly selection of opinions and analyses from the Arab media around the world.
This article highlights a range of unsuspecting people, places, and activities you probably didn’t know existed between Israel and Taiwan.
A weekly selection of opinions and analyses from the Arab media around the world.
Taiwan has complained in recent years of almost daily missions by the Chinese air force, often in the southwestern part of its air defense identification zone.
Taiwan's military sent aircraft and ships to keep watch and activated shore-based missile systems, it added, without providing further details.
The strait, which separates China from the democratically governed island of Taiwan, is a frequent source of tension as Beijing steps up its political and military pressure.
Taiwan's President Tsai Ing-wen's government has repeatedly warned of China's attempts to influence public opinion on the democratically governed island.
Chinese readout of Sunday's meetings described it as constructive but made clear that Taiwan is the most important issue, and a potentially dangerous one.