By Gregor Stuart Hunter SINGAPORE (Reuters) -The yen tumbled against the U.S. dollar by the most in five months in early trading on Monday after Sanae Takaichi won the LDP leadership election at the weekend, setting the country on course for more expansionary fiscal policy and complicating the task facing the Bank of Japan. The yen sank 1.5% to 149.73 yen on the dollar, its biggest one-day slide since May 12, wiping out gains it made in the past week as markets resumed trading in Asia. Against the euro, the Japanese currency fell 1.3% to 175.39 yen, nearing its weakest since the creation of the European single currency. A former economic security and internal affairs minister with an expansionary fiscal agenda for the world's fourth-largest economy, Takaichi's victory puts her on course to

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