Shigeru Ishiba, right, with Japan’s Prime Minister Fumio Kishida, left, and other candidates, celebrates after Ishiba was elected as new head of Japan’s ruling Liberal Democratic Party during its leadership election Friday, Sept. 27, 2024, in Tokyo. (AP Photo/Hiro Komae, Pool)

Japan's incoming prime minister, Shigeru Ishiba, said he wanted to clean up his ruling party, revitalise the economy and see off security threats from powerful neighbours after triumphing in his fifth and what he called final leadership bid on Friday.

Former Defense Minister Shigeru Ishiba, a plain-spoken populist, won leadership of Japan’s ruling Liberal Democratic Party in a runoff vote on Friday.