China has fired back at the U.S. with a surprising move—an antitrust investigation into Google. The probe comes just days after President Donald Trump slapped a 10% tariff on Chinese goods, reigniting trade tensions between the two economic giants.

The investigation, led by China’s State Administration for Market Regulation, will look into claims that Google has violated China’s Anti-Monopoly Law. While Google’s search engine and other services have been blocked in China since 2010, the company still operates in the country, mainly focusing on its advertising business.

This isn’t the only step Beijing has taken in response to Trump’s tariffs. China has also imposed new levies on U.S. coal, liquefied natural gas, and agricultural equipment, hitting key American industries. Additionally, companies like Calvin Klein’s parent firm PVH Corp. and gene sequencing leader Illumina have been added to China’s restricted entities list.

The timing of these moves is notable. Relations between the U.S. and China seemed to be improving after months of strained ties, but Trump’s latest tariffs—justified as a response to illegal drug flows—have thrown a wrench into the progress.

The situation is still unfolding, and more developments are expected. For now, the spotlight is on Google as it faces scrutiny in one of the world’s largest markets.

Stay tuned for updates as this story continues to develop.