U .S. trading partners are weighing responses after President Donald Trump’s latest action on tariffs sparked a stock market selloff Monday.

China warned President Trump on Tuesday against restarting trade tensions and that it would hit back at countries that make deals with the US to exclude China from supply chains. Last month, the US and China agreed on a trade framework to ease tensions,

Its new deal with Vietnam and its fresh tariff threats issued to many other countries seem designed to reduce China’s role in their supply chain. Countries that had hoped to stay out of the new cold war now fear they are being forced to pick a side. To appease the world’s biggest market, they must anger the world’s biggest trader.