China vowed to fight the United States “to the end” in response to President Donald Trump’s steep tariffs as tensions over Beijing’s handling of the fentanyl crisis turn into a global war over trade.

The tariff dispute began just over two months ago when Trump slapped 10% tariffs on China in an effort to incentivize Beijing to take more aggressive action to end the fentanyl crisis. That number has increased since February, with China now facing up to 104% tariffs from the U.S. In retaliation, Beijing announced 10-15% tariffs on U.S. agricultural and energy products, followed by an additional 34% tariff on all U.S. imports last Friday.