Wu noted China flew 10 warplanes into Taiwan's air defense identification zone on Monday and deployed an aircraft carrier group for exercises near Taiwan.
"We are willing to defend ourselves, that's without any question," Wu told reporters.
"We fill fight a war if we need to fight a war, and if we need to defend ourselves to the very last day, then we will defend ourselves to the very last day."
China does not recognise Taiwan's democratically elected government, and leader Xi Jinping has said "unification" between the sides cannot be put off indefinitely.
"On the one hand they want to charm the Taiwanese people by sending their condolences, but at the same time they are also sending their military aircraft and military vessels closer to Taiwan aimed at intimidating Taiwan's people," Wu said at a ministry briefing.
"The Chinese are sending very mixed signals to the Taiwanese people and I would characterize that as self-defeating," Wu said.
The vast improvements in China's military capabilities and its increasing activity around Taiwan have raised concerns in the US, which is legally bound to ensure Taiwan is capable of defending itself and to regard all threats to the island's security as matters of grave concern."
Speaking in Washington, State Department spokesman Ned Price reaffirmed the US commitment to Taiwan.
"The United States maintains the capacity to resist any resort to force or any other forms of coercion that would jeopardize the security or the social or economic system of the people on Taiwan," Price said Wednesday.
The naval drills being conducted in waters off Taiwan were meant to help China "safeguard national sovereignty, security and development interests," the army said Monday, using language often interpreted as being directed at Taiwan's leadership that has refused to give in to Beijing's demands that it recognize the island as part of Chinese territory.
Taiwan and China split amid civil war in 1949, and most Taiwanese favour maintaining the current state of de facto independence while engaging in robust economic exchanges with the mainland.
China has created conditions for greater economic integration, while also targeting some communities such as pineapple farmers in hopes of weakening their support for the island's government.
Chinese diplomatic pressure has been growing also, reducing the number of Taiwan's formal diplomatic allies to just 15 and shutting its representatives out of the World Health Assembly and other major international forums.
Taiwan has responded by boosting its high-tech industries and unofficial foreign relations, particularly with its key partners the US, Japan and others, and by building up its own defense industries, including a submarine development program, while buying upgraded warplanes, missiles and other military hardware from the US.
Meanwhile, the US Navy says the carrier Theodore Roosevelt and its strike group reentered the South China Sea on Saturday to "conduct routine operations." It is the second time the strike group has entered the waterway this year as part of its 2021 deployment to the US 7th Fleet area of operations.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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