This is reported by RIA Novosti with reference to the statement of the ministry.

According to him, Taiwan sent an air patrol to monitor the aircraft.

In addition, the Taiwanese side deployed anti-aircraft missile systems.

Earlier, Chinese Defense Minister Wei Fenghe stressed that if someone dares to break off Taiwan, the Chinese army will certainly be ready to fight, will not stand up for the price to destroy any plans to separate Taiwan or achieve its independence. 

Also, the Chinese Foreign Ministry threatened the United States with serious consequences for encouraging separatism in Taiwan.