Chinese military exercises near Taiwan are targeted at forces promoting the island's formal independence and are a "just" move to protect peace and stability, China's Taiwan Affairs Office said on Wednesday.

It also said the exercises are aimed at interference by external forces.

Military tensions with China, which claims Taiwan as its own territory, are at their worst in more than 40 years, Taiwan's defence minister said last week, adding China will be capable of mounting a "full scale" invasion by 2025.