Asian Trading Partners Grapple with New US Tariffs After Supreme Court Ruling

US trading partners in Asia faced renewed uncertainty over trade policies this weekend after President Donald Trump announced a new tariff on imports, hours after the Supreme Court struck down many of the sweeping levies that had sparked a global trade war.

The court’s ruling invalidated several tariffs that had targeted major exporters such as China, South Korea, Japan, and Taiwan, all crucial players in global technology and semiconductor supply chains. Within hours, Trump announced a 10 percent tariff on all US imports starting February 24, later raising it to 15 percent on February 21. The new levies, enacted under a different statute, will remain in effect for 150 days, prompting analysts to warn of further uncertainty for businesses and investors.

Before the ruling, Trump’s tariffs had already strained diplomatic relations in Asia. In Japan, government officials said they would study the Supreme Court decision and the administration’s response before taking action. Itsunori Onodera, a former defense minister and executive of Prime Minister Sanae Takaichi’s Liberal Democratic Party, described the new tariffs as “outrageous” and warned they could push allied countries further from the United States.

China, preparing to host Trump in late March, has not publicly responded to the latest measures while the country observes an extended holiday. Hong Kong, operating as a separate customs territory, highlighted the situation as an advantage. Christopher Hui, Hong Kong’s secretary for financial services and the treasury, described the US tariffs as a “fiasco” and said they reinforced the city’s policy stability and predictability for investors. Hong Kong-made products generally face lower US duties, allowing trade to continue even amid heightened US-China tensions.

Analysts warned that the Supreme Court ruling, which applied only to tariffs imposed under the International Emergency Economic Powers Act, would not eliminate uncertainty. Trade policy monitor Global Trade Alert estimated that the ruling reduces the US trade-weighted average tariff from 15.4 percent to 8.3 percent, with countries such as China, Brazil, and India seeing double-digit percentage-point cuts, though their overall tariffs remain high.

Taiwan said it was monitoring the situation closely. The government highlighted ongoing discussions with the US over the implementation of recent trade deals, including a memorandum of understanding committing Taiwan to $250 billion in investment and a separate agreement to reduce reciprocal tariffs. While initial effects appear limited, officials said they would stay in close contact with Washington.

Thailand’s Trade Policy and Strategy Office head Nantapong Chiralerspong noted that the ruling could provide a short-term boost to exports, as companies accelerate shipments in a wave of “front-loading” to avoid higher tariffs in the future.

US trading partners in Asia are now navigating a complex landscape, balancing the potential benefits of tariff reductions with the risk of new duties and ongoing uncertainty about the US administration’s next moves.