TAIPEI—Eight Chinese bomber planes and four fighter jets entered the southwestern corner of Taiwan’s air defense identification zone on Saturday, and Taiwan’s air force deployed missiles to “monitor” the incursion, the island’s Defense Ministry said. China, which claims Taiwan as its own territory, has conducted almost daily flights over the waters between the southern part of Taiwan and the Taiwan-controlled Pratas Islands in the South China Sea in recent months. However, they have generally consisted of just one or two reconnaissance aircraft. The presence of so many Chinese combat aircraft on this mission—Taiwan said it was made up of eight nuclear-capable H-6K bombers and four J-16 fighter jets—is unusual. A map provided by Taiwan’s Defence Ministry showed that the Chinese aircraft, which also included a Y-8 anti-submarine aircraft, flew over the same waters where the most recent Chinese missions have been taking place near the Pratas Islands, though still well …