China has announced a flurry of retaliatory measures against the U.S., including tariffs on imports of products such as coal, liquefied natural gas products and crude oil, as well as an antitrust probe into Google.

China said it had started an antitrust investigation of Google, which works with Chinese companies on smartphones and advertising outside the country.

China will impose a 15% tariff on imports of U.S. coal and liquefied natural gas, and a 10% tariff on crude oil, agricultural machinery, large engin