No Japanese premier has visited the Yasukuni shrine since 2013 and Ishiba's predecessor Fumio Kishida would also regularly send offerings for its biannual spring and autumn festivals.

Yasukuni in central Tokyo is dedicated to 2.5 million war dead, mostly Japanese, who have perished in conflicts since the late 19th century.

But this includes senior military and political figures convicted by an international tribunal of war crimes prior to and during World War II.

Every year, dozens of lawmakers pay their respects during the spring and autumn festival and in August for the anniversary of the emperor announcing Japan's surrender in 1945.

But a Japanese prime minister has not appeared there since 2013, when Shinzo Abe sparked fury in Beijing and Seoul and earned a rare diplomatic rebuke from close ally the United States.

Ishiba, who became Japan's prime minister on October 1, is also expected to refrain from visiting the shrine in person during the autumn festival through Saturday, Kyodo News reported, citing an unnamed person close to him.

The minister of health, labour and welfare, Takamaro Fukuoka, also sent a "masakaki" tree offering, the spokesman for the shrine told AFP.