Japan slammed on Tuesday what it called the first confirmed incursion by a Chinese military aircraft into its airspace as a "serious violation" of its sovereignty, saying it was part of a pattern by Beijing.
"The violation of our airspace by Chinese military aircraft is not only a serious violation of our sovereignty but also a threat to our security and is totally unacceptable," chief government spokesman Yoshimasa Hayashi said a day after the incident over the East China Sea.
