China ratcheted up trade tensions with the United States with an export ban on several materials with high-tech and military applications, in a tit-for-tat move after U.S. President Joe Biden’s administration escalated technology curbs on Beijing.

Gallium, germanium, antimony and superhard materials are no longer allowed to be shipped to America, the Chinese Ministry of Commerce said in a statement Tuesday. Beijing will also place tighter controls on sales of graphite, it added.

The move came after the White House on Monday slapped fresh curbs on the sale of high-bandwidth memory chips made by U.S. and foreign companies to China. The Biden administration’s goal is to slow China’s development of advanced semiconductors and artificial intelligence systems that may help its military.

The targeted metals are used in everything from semiconductors to satellites and night-vision goggles. China is the top global supplier of dozens of critical minerals, and concerns about its dominance have been mounting in Washington since the country placed initial controls on exports of gallium and germanium last year. That move sent prices spiking and upended trade flows as manufacturers sought alternative supply, while miners moved to tap new deposits and politicians sought to replenish national strategic reserves.

Several buyers of the materials — including Globalwafers, Lumentum, and Coherent — said at the time they didn’t expect near-term disruptions because the industry had ample inventories to fall back on, and alternative sources of supply could be found.

And Chinese customs data shows zero reported exports of gallium and germanium to the U.S. this year, which suggests that American industries were instead drawing on inventories or procuring the metals from other sources.

However, prices for both metals have surged since the restrictions were announced last year — the price of gallium has risen 80%, while that for germanium has more than doubled.

A White House spokesperson said that the U.S. is still assessing the new restrictions and looking for ways to mitigate their impact, while adding that China’s move highlighted the need to diversify critical supply chains. The U.S. Commerce Department’s Bureau of Industry and Security declined to comment.

China is opposed to the outgoing U.S. administration broadening its "illegal” unilateral sanctions, Foreign Minister Wang Yi said Tuesday at a meeting with visiting delegates from the National Committee on American Foreign Policy.

"We urge the U.S. side to do more things that would help stabilize the bilateral relationship, and hope that the new administration will take a good first step in China-U.S. interactions in the next four years,” he said.

In a report last month, the U.S. Geological Survey said any total export ban on gallium and germanium would deliver a $3.4 billion hit to the U.S. economy.

"Export bans on critical minerals have been in the hopper for some time and are intended as a warning,” said Joe Mazur, senior analyst with consulting firm Trivium China. "It’s a clear signal that China is preparing to strike back more forcefully against U.S. economic pressure than it has in the past few years.”

The measures announced by the U.S. on Monday blacklisted 140 additional Chinese entities accused of acting on Beijing’s behalf, with a focus on companies that produce chip manufacturing equipment that’s crucial to China’s pursuit of semiconductor self-sufficiency.

Separately on Tuesday, three Chinese industry associations — representing the internet, semiconductor and auto sectors — urged Chinese companies to choose carefully when buying chips from U.S.