Former U.S. President Barack Obama, in a memoir released Tuesday, recalled his frustration with Japan's era of revolving-door prime ministers that coincided with his presidency and described one of his former counterparts Yukio Hatoyama as "awkward.""A pleasant if awkward fellow, Hatoyama was Japan's fourth prime minister in less than three years and the second since I'd taken office -- a symptom of the sclerotic, aimless politics that had plagued Japan for much of the decade," Obama, who was president for eight years from 2009, said in the book titled "A Promised Land."The book is the firs…READ FULL ARTICLE