China announced Friday that it will raise tariffs on U.S. goods from 84% to 125% — the latest salvo in an escalating trade war between the world's two largest economies that has rattled markets and raised fears of a global slowdown. While U.S. President Donald Trump paused import taxes this week for other countries, he raised tariffs on China and they now total 145%. China has denounced the policy as “economic bullying" and promised countermeasures. The new tariffs begin Saturday. Washington's repeated raising of tariffs “will become a joke in the history of the world economy,” a Chinese Finance Ministry spokesman said in a statement announcing the new tariffs. “However, if the U.S. insists on continuing to substantially infringe on China’s interests, China will resolutely counter and fight to the end.” China’s Commerce Ministry said it would file another lawsuit with the World Trade Organization against the U.S. tariffs. “There are no winners in a tariff war,” Chinese leader Xi Jinping said during a meeting with the Spanish Prime Minister Pedro Sanchez, according to a readout from state broadcaster CCTV. “For more than 70 years, China has always relied on itself ... and hard work for development, never relying on favors from anyone, and not fearing any unreasonable suppression.” Trump's on-again, off-again measures have caused alarm in stock and bond markets and led some to warn that the U.S. could be headed for a recession. There was some relief when Trump paused the tariffs for most countries — but concerns remain since the U.S. and China are the world's No. 1 and No. 2 economies, respectively.