Sanae Takaichi was elected LDP leader and faces a vote to be prime minister later in October. Photo: AP PHOTO

Japan's ruling coalition has broken up, with junior partner Komeito rebelling against the Liberal Democratic Party's new hardline leader Sanae Takaichi in a move that casts doubt over her premiership bid.

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Takaichi, selected by the LDP as its new head in a weekend vote, must win approval in parliament to become Japan's first female prime minister later this month.

While her party holds the largest number of seats, it is short of a majority, and the main opposition party has

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