Chinese tech hub Shenzhen becomes key trade war battleground as US strikes at Huawei, its ‘dragon’s head’

• As home to some of the country’s biggest exporters and tech firms, including Tencent and ZTE, few other places in China are more exposed to Washington’s tariffs
• No company is more important to the city than Huawei, which has been hit by a range of US sanctions that could have a profound knock-on effect