Japan's political environment underwent yet another virtual earthquake in the past week with the departure of Democratic Party of Japan prime minister Hatoyama Yukio after less than nine months in office and his replacement as DPJ president and prime minister by his former deputy prime minister and finance minister Kan Naoto Tuesday.
Hatoyama had entered office last September on a wave of popular expectations after the centrist DPJ swept last August's Diet lower house elections and ended over two decades of consecutive conservative Liberal Democratic Party rule.