Tsai's comments Tuesday follow what the island's defense ministry called a major foray by Chinese military planes into airspace just south of the island on Monday.
That included bombers, fighter jets, and early warning and control aircraft.
Tsai told a security forum in Taipei that such actions "only serve to strengthen our resolve." China's ruling Communist Party considers Taiwan its own territory, although it has never governed the island, which split from the mainland amid civil war in 1949.
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