U.S. President Donald Trump announced hefty tariffs on $50 billion of Chinese imports on Friday as Beijing threatened to respond in kind, in a move that looks set to ignite a trade war between the world's two largest economies.

Trump, whose hard-line stance on trade has seen him wrangle with allies, said in a statement that a 25 percent tariff would be imposed on a list of strategically important imports from China. He also vowed further measures if Beijing struck back.

"The United States will pursue additional tariffs if China engages in retaliatory measures, such as imposing new tariffs on United States goods, services, or agricultural products; raising non-tariff barriers or taking punitive actions against American exporters or American companies operating in China," Trump said in a statement.