TOKYO (Reuters) - Japanese Prime Minister Shinzo Abe abruptly announced his resignation on Wednesday after a year in power dogged by scandals, an election rout and a crisis over Japan's support for U.S.-led operations in Afghanistan. ADVERTISEMENT The hawkish Abe, who took office promising to boost Japan's global security profile, had seen his clout dwindle after a drubbing in upper house elections in July, but the announcement came as a bolt out of the blue. "I determined today that I should resign," a weary-looking Abe told a news conference. Senior officials said health was a factor in the decision but...