Twenty Chinese military aircraft entered Taiwan's air defense identification zone on Friday, in the largest incursion yet reported by the island's Defense Ministry and marking a dramatic escalation of tension across the Taiwan Strait.

The island's Defense Ministry said the air force deployed missiles to "monitor" the incursion into the southwestern part of its air defense identification zone. It also said its planes warned the Chinese aircraft, including by radio.

It marked the largest incursion to date by the Chinese air force since Taiwan's Defense Ministry began disclosing almost daily Chinese military flights over the waters between the southern part of Taiwan and the Taiwan-controlled Pratas Islands in the South China Sea last year.