China said on Wednesday its recent series of drills near Taiwan aimed at combating the "arrogance" of separatist forces, while the front-runner to be Taiwan's next president said China was trying to "annex" the island.

Taiwan, which China claims as its own territory, has said this month that it had observed dozens of fighters, drones, bombers and other aircraft, as well as warships and the Chinese aircraft carrier Shandong, operating nearby.

The increased frequency of China's military activities has raised the risk of events "getting out of hand" and sparking an accidental clash, the island's defense minister has warned.