China’s Year High for Incursions into Taiwanese Air Spac

On a record-setting day, 25 Chinese military aircraft entered Taiwan's Air Defense Identification Zone (ADIZ) via five different flight paths. The aircraft included J10 and J16 fighters, H6K bombers, Y8 anti-submarine planes, and a KJ500 early warning plane. This surpassed the previous high of 20 aircraft on March 26. The incursions were reportedly in response to a US-Taiwan accord on coast guard cooperation.

On what date was the previous record of 20 Chinese planes entering Taiwan's ADIZ set?

What was the response that led to the recent entries of Chinese aircraft into Taiwan's ADIZ?