U.S. President Donald Trump and Chinese leader Xi Jinping confronted weeks of brewing trade tensions and a battle over critical minerals in a rare leader-to-leader call on Thursday that left key issues to further talks.

U.S. President Donald Trump and Chinese leader Xi Jinping agreed to further talks between the countries to hash out differences on tariffs that have roiled the global economy, according to United States and Chinese summaries of their phone call.

President Trump spoke to China’s top leader, Xi Jinping, on Thursday for the first time since taking office, according to Chinese state media, as a fragile détente in a trade war between the world’s two largest economies shows signs of unraveling.