Nvidia CEO Jensen Huang says his firm is "doing our best" to serve China's vast market for semiconductors after it secured permission from the United States to sell chips to the world's second-largest economy. Huang is in the Chinese capital this week to attend the China International Supply Chain Expo, a forum for the country to boost its image as the global defender of free trade in contrast to the tariff chaos sparked by US President Donald Trump. He told reporters that top Chinese officials had assured him this week that China was "open and stable". IMAGES AND SOUNDBITES