Alliance minders in Washington and Tokyo are feeling some anxiety today. Shigeru Ishiba has won the contest for leadership of Japan’s Liberal Democratic Party (LDP), which means he will become Japan’s next prime minister, succeeding Kishida Fumio — probably Tuesday.

Ishiba, who is 67 and was first elected to the Diet in 1986, has vowed to shake up the 72-year-old security alliance between the United States and Japan, a bilateral alliance that in recent years has focused on maintaining U.S. primacy in East Asia and blocking China’s rise. He views it (correctly, I think) as “asymmetrical,” with Washington largely dictating Japanese foreign policy.

“I don’t think Japan is a truly independent nation yet,” Ishiba, the former defense minister, wrote in a book published just before the leadership race.

Some have called Ishiba a Gaullist; he certainly is a nationalist. In his fifth run for the top party position, he suggested that Japan share command and control over U.S. troops on Japanese soil, and even raised the possibility of stationing some Japanese soldiers on American territory (Guam).