CANBERRA (Reuters) - Australian Prime Minister Julia Gillard backed a ban on Chinese telecoms firm Huawei from tendering for major government contracts on Thursday after Beijing raised concerns about fair treatment for Chinese firms. Australia has blocked Huawei Technologies Co Ltd, the world's largest telecoms company, from tendering for contracts in Australia's $38 billion high-speed broadband network (NBN) due to undefined security concerns. Gillard told reporters she stood by the decision, saying the move was not against trade rules, and pointed to China's own rules on telecoms ...