China’s military simulated precision strikes against Taiwan on the second day of drills around the island on Sunday, with the island’s defence ministry reporting multiple air force sorties and that it was monitoring China’s missile forces.

China, which claims democratically governed Taiwan as its own territory, began three days of military exercises around the island on Saturday, the day after Taiwan President Tsai Ing-wen returned from a brief visit to the US.

Chinese state television reported that the combat readiness patrols and drills around Taiwan were continuing.

“Under the unified command of the theatre joint operations command centre, multiple types of units carried out simulated joint precision strikes on key targets on Taiwan island and the surrounding sea areas, and continue to maintain an offensive posture around the island,” it said.

The Chinese military’s Eastern Theatre Command put up a short animation of the simulated attacks on its WeChat account, showing missiles fired from land, sea and air into Taiwan with two of them exploding in flames as they hit their targets.

A source familiar with the security situation in the region told Reuters that China had been conducting simulated air and sea attacks on “foreign military targets” in the waters off Taiwan’s southwestern coast.

“Taiwan is not their only target,” the source said, speaking on condition of anonymity as they were not authorised to speak to the media. “It’s very provocative.”

Taiwan’s defence ministry said that as of 8am (GMT) on Sunday, they had spotted 70 Chinese aircraft, including Su-30 fighters and H-6 bombers, as well as 11 ships, around Taiwan.

The ministry said they were paying particular attention to the People’s Liberation Army’s Rocket Force which is in charge of China’s land-based missile system.

“Regarding the movements of the Chinese communists’ Rocket Force, the nation’s military also has a close grasp through the joint intelligence, surveillance and reconnaissance system, and air defence forces remain on high alert,” the ministry said.

It reiterated that Taiwan’s forces will “not escalate conflicts nor cause disputes” and would respond “appropriately” to China’s drills.

The security source said about 20 military ships, half from Taiwan and half from China, were engaged in a stand-off near the Taiwan Strait’s median line, which has for years served as an unofficial barrier between the two sides but did not behave provocatively.

Zhao Xiaozhuo of China’s Academy of Military Sciences told the Chinese state-backed Global Times newspaper that this was the first time China had openly talked of simulated attacks on targets in Taiwan.