Japan calls North Korea nuclear test 'extremely unforgivable', files protest with country's Beijing embassy

File image of Japan prime minister Shinzo Abe. AFP[/caption]"The government confirms that North Korea conducted a nuclear test after examining information from the weather agency and other information," Japanese foreign minister Taro Kono told reporters.He said the government registered a protest with the North Korean embassy in Beijing prior to the confirmation, calling any test "extremely unforgivable".Japanese Prime Minister Shinzo Abe on Sunday said a sixth nuclear test by Pyongyang would be "absolutely unacceptable," after a 6.3 magnitude explosion in the North indicated a new detonation."If it forcibly conducted a nuclear test, it's absolutely unacceptable. We have to strongly protest it," Abe said. "There is a possibility that this is not a natural quake and that North Korea conducted a nuclear test," he said, adding that the Japanese weather agency detected a seismic wave.