China has never renounced the use of force to bring the island under its control.
Taiwan's air force sent up a combat air patrol and warned the Chinese aircraft away, the ministry added.
Japan's Defense Ministry said a Chinese aircraft carrier has sailed through waters between two islands in Okinawa Prefecture, southwestern Japan.
"We are willing to defend ourselves without any questions and we will fight the war if we need to fight the war".
Meanwhile, the U.S. administration led by President Joe Biden has reaffirmed a pledge to oppose any unilateral action that threatens to undermine Japan's administration of the islands and that the United States is obliged to defend Japan from any attack.
"In the future, the PLA Navy will continue to carry out such exercise and training activities on a regular basis as planned", said the spokesperson.
The U.S. Navy said on Tuesday that its Theodore Roosevelt Carrier Strike Group (TRCSG) entered the South China Sea on April 4 to conduct routine operations, its second such visit this year, amid stepped up U.S.
The carrier group consists of the lead ship Liaoning, with a Type 055 class stealth guided-missile destroyer Nanchang, two Type 052D destroyers Chengdu and Taiyuan, the Type 054A frigate Huanggang and the Type 901 comprehensive supply ship Hulunhu.
A person familiar with Taiwan's security planning told Reuters the carrier group is still "near the Japanese islands", though declined to disclose the exact location.
According to information published by Nikkei Asia on April 6, 2021, the Chinese aircraft carrier Liaoning and five escort vessels have passed through a key waterway off Japan on their way to the Pacific Ocean.
Taiwan is China's most sensitive territorial issue and a potential military flashpoint.
Wu said they were determined to improve their military capabilities and spend more on defense.
"The defence of Taiwan is our responsibility. We will try every way we can to improve our defense capability".
On Monday, the Ministry of National Defense of the People's Republic of China officially reported that the Liaoning aircraft carrier formation conducted the training exercise in waters around Taiwan.
"The drills are designed based on the toughest enemy threats, simulating all possible scenarios on an enemy invasion on Taiwan", Major General Liu Yu-Ping told reporters.
When asked if Washington's de facto embassy, the American Institute in Taiwan, would send representatives to oversee the drills, Liu said such a plan was "discussed" but "will not be implemented", citing military sensitivity.