FILE - In this Sept. 27, 2021 file photo, steam billows out of the cooling towers at a coal-fired power station in Nanjing in east China's Jiangsu province. An independent research group says China has overtaken Germany as the biggest buyer of Russian energy exports since the start of the war in Ukraine. The Centre for Research on Energy and Clean Air said Monday, June 13, 2022 that Russia received about 93 billion euros in revenue from the sale of oil, natural gas and coal since the Feb. 24 invasion. (Chinatopix via AP, File)