BANGKOK – In a significant legal development, the U.S. Supreme Court has struck down President Donald Trump’s tariffs, prompting keen attention from countries like China and South Korea as they anticipate Washington’s next move. Meanwhile, financial markets have shown resilience, absorbing the news without much turbulence.

The ruling, unveiled on Friday, has the potential to upend agreements forged during trade negotiations following Trump’s broad imposition of tariffs on numerous nations in April 2025. This decision casts uncertainty on the future of these economic engagements.

The Chinese Ministry of Commerce has expressed its intention to carry out a “comprehensive assessment” of the court’s decision, which invalidated the tariffs under the International Emergency Economic Powers Act (IEEPA). This assessment underscores the complex dynamics of international trade and legal frameworks.

In a statement, a Chinese ministry spokesperson urged the U.S. to remove these unilateral tariffs, emphasizing that such measures serve no one’s interest. The spokesperson, as reported by the official Xinhua News Agency, reiterated Beijing’s belief that trade wars yield no winners and criticized the tariffs for violating both international trade norms and U.S. domestic law.

In response to the Supreme Court’s decision, President Trump has proposed a new strategy, suggesting a 10% global tariff through Section 122 of the 1974 Trade Act, which he later adjusted to 15%. This move indicates the administration’s intent to maintain a firm stance on trade despite the legal setback.

Trump responded to the Supreme Court decision by proposing a new 10% global tariff under an alternative law, Section 122 of the 1974 Trade Act, and later increased it to 15%.

For China and some other countries in Asia that were subject to higher import duties on their exports, that could potentially bring some relief. But for others such as Japan, the United Kingdom and other U.S. allies, tariffs could rise.

The U.S. plans to stand by its trade deals and expects its partners to do the same, U.S. Trade Representative Jamieson Greer said in a CBS News interview Sunday.

“The deals were not premised on whether or not the emergency tariff litigation would rise or fall,” said Greer, Trump’s top trade negotiator. “I haven’t heard anyone yet come to me and say the deal’s off. They want to see how this plays out.”

Uncertainty may worsen if the Trump administration continues imposing new tariffs under alternative laws, South Korea’s trade minister, Kim Jung-kwan, said Monday.

The South Koreans have agreed to hold “amicable” discussions with U.S. officials in order to minimize any negative impact on South Korean companies, he said. Major South Korean exports such as autos and steel are subject to tariffs under other trade laws.

“Given the uncertainty over future U.S. tariff measures, the public and private sectors must work together to strengthen our companies’ export competitiveness and diversify their markets,” Kim said.

U.S. Treasury Secretary Scott Bessent also said Sunday that he believed trading partners would abide by existing deals and that tariff revenues will remain steady.

“Tariff revenues will be unchanged this year and will be unchanged in the future,” Bessent said in a Fox News interview, pointing to the new 15% global tariffs Trump has said he wants as a replacement.

The administration would defer to the courts on whether to give companies refunds for the import taxes already collected under the tariffs now declared unlawful, Bessent said.

“It’s out of our hands and we will follow the court’s orders,” he said.

U.S. futures sank early Monday, with the contract for the S&P 500 down 0.6% and that for the Dow Jones Industrial Average falling 0.5%. Oil prices fell and the U.S. dollar weakened against the Japanese yen and the euro.

But share prices in Asia mostly advanced, with Hong Kong’s Hang Seng gaining 2.4%.

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Kim Tong-hyung in Seoul, South Korea, contributed.