Chinas Huawei Technologies Co Ltd maintained calm and operated business as usual after media reports saying the U.S. accessed servers at the telecom giants Shenzhen headquarters, acting Chief Executive Eric Xu said on Monday. Earlier this month, the New York Times and Der Spiegel cited documents leaked by former U.S. security contractor Edward Snowden as saying the National Security Agency obtained sensitive data and monitored Huawei executives communications. I think it will take a lot of effort to address (allegations that Huawei has the capacity to spy). (Reporting by Yimou Lee in SHENZHEN;