Beijing has urged Washington to scrap planned tariffs of up to 100 per cent on imported drones, warning the measures unfairly target Chinese products and threaten global supply chains.The tariffs are not set to take effect until September 3, but Chinese drone shipments to the United States are already under pressure, with exports of some models plunging in July, the latest customs data showed.On Thursday, He Yadong, a spokesman for the Ministry of Commerce, said Beijing firmly opposed...