It has been called the crown jewel of the Chinese technology industry, but now one of its top executives has been arrested. Meng Wanzhou, the chief financial officer of Huawei, was detained in Canada and the United States wants her to be extradited. It comes as heightened economic tensions between the US and China seemed to be cooling - at least a little. Last week, US President Donald Trump and China's Xi Jinping held talks on the sidelines of the G20 summit. Washington agreed not to increase tariffs on January 1. Meng was detained on the same day the two leaders met.