article_snippet.sent: Gen Nakatani said the nation's war planes can be scrambled whenever there is a report of an unidentified flying object but, so far, the nation's war planes had not encountered visitors from space.
article_snippet.sent: When the Air Self Defence Force detects indications of an unidentified flying object that could violate Japan's airspace, the Air Self Defence Force scrambles fighter jets if necessary and makes visual observation,' Gen Nakatani said. '
article_snippet.sent: They sometimes find birds or flying objects other than aircraft
article_snippet.sent: but I don't know a case of finding an unidentified flying object believed to have come over from anywhere other than Earth,' Gen Nakatani said.
article_snippet.sent: A 2007 statement said the government 'has not confirmed the existence of unidentified flying objects believed to have come from anywhere other than Earth'.