A USA fighter jet has crashed into the sea off the Japanese island of Okinawa.
F-15 fighters have also crashed off Okinawa Prefecture in May 2013, January 2006 and August 2002.
Japan's Kyodo news agency says the jet was stationed at the Kadena Air Base and crashed about 80 kilometers off the coast of southern Okinawa.
The fighter was conducting a routine training flight, according to the air base, when the plane crashed into the waters south of Okinawa, Japan, where the base is located.
Okinawa Prefecture has been the site of several recent accidents and incidents involving USA military aircraft, including the Osprey tilt-rotor transport aircraft.
The incident marks the 12th crash involving USA military aircraft this fiscal year.
After two helicopters made emergency landings in Japan at the beginning of 2018, Defense Secretary James Mattis called to apologize for a series of US aerial accidents.More news: The intense video Trump showed Kim during his historic summit
Defence Minister Itsunori Onodera said he has told the United States military to take steps to ensure safety and prevent similar accidents.
"I will ask for detailed reports about why it happened", he added.
"If that happens, we can not fulfill our responsibilities to our children and grandchildren", Onaga said.
Kadena Air Base, where around 47,000 American troops are based, thanked ASDF for saving the pilot in a statement on Twitter.
"We can not fulfill our responsibilities for our children and their children if such a situation becomes the norm", he said.
"The Japanese government doesn't have the capacity to address the problems as its own", the governor said.