Financial markets welcomed a U.S. court ruling that blocks President Donald Trump from imposing sweeping tariffs on imports under an emergency-powers law.

U.S. futures jumped early Thursday and oil prices rose more than $1. The U.S. dollar rose against the yen and euro.

The court found the 1977 International Emergency Economic Powers Act, which Trump has cited as his basis for ordering massive increases in import duties, does not authorize the use of tariffs.

The White House immediately appealed and it was unclear if Trump would abide by the ruling in the interim. The long term outcome of legal disputes over tariffs remains uncertain. But investors appeared to take heart after the months of turmoil brought on by Trump's trade war.

The future for the S&P 500 was up 1.5% while that for the Dow Jones Industrial Average gained 1.2%.

In early European trading, Germany's DAX gained 0.5% to 24,160.75. The CAC 40 in Paris jumped 0.9% to 7,860.67. Britain's FTSE was nearly unchanged at 8,722.63.

Japan's Nikkei 225 index jumped 1.9% to 38,432.98. American's largest ally in Asia has been appealing to Trump to cancel the tariffs he has ordered on imports from Japan and to also stop 25% tariffs on steel, aluminum and autos.
A U.S. Customs and Border Protection technician examines overseas parcels after they were scanned at the agency's overseas mail inspection facility at Chicago's O'Hare International Airport on Feb. 23, 2024.

The ruling also pushed the dollar sharply higher against the Japanese yen. It was trading at 145.40 yen early Thursday, up from 144.87 yen late Wednesday.

A three-judge panel ruled on several lawsuits arguing Trump exceeded his authority, casting doubt on trade policies that have jolted global financial markets, frustrated trade partners and raised uncertainty over the outlook for inflation and the global economy.

Many of Trump's double-digit tariff hikes are paused for up to 90 days to allow time for trade negotiations, but the uncertainty they cast over global commerce has stymied businesses and left consumers wary about what lies ahead.

"Just when traders thought they'd seen every twist in the tariff saga, the gavel dropped like a lightning bolt over the Pacific," Stephen Innes of SPI Asset Management said in a commentary.

The ruling was, at the least, "a brief respite before the next thunderclap," he said.

Elsewhere in Asia, Hong Kong's Hang Seng added 1.3% to 23,561.86, while the Shanghai Composite index gained 0.7% to 3,363.45.

Australia's S&P/ASX 200 gained 0.2% to 8,409.80.

In South Korea, which like Japan relies heavily on exports to the U.S., the Kospi surged 1.9% to 2,720.64. Shares also were helped by the Bank of Korea's decision to cut its key interest rate to 2.5% from 2.75%, to ease pressure on the economy.
Taiwan's Taiex edged 0.1% lower, and India's Sensex lost 0.2%.

On Wednesday, U.S. stocks cooled, with the S&P 500 down 0.6% but still within 4.2% of its record after charging higher amid hopes that the worst of the turmoil caused by Trump's trade war may have passed. It had been roughly 20% below the mark last month.

The Dow industrials lost 0.6% and the Nasdaq composite fell 0.5%.

Trading was relatively quiet ahead of a quarterly earnings release for Nvidia, which came after markets closed.

The bellwether for artificial intelligence overcame a wave of tariff-driven turbulence to deliver another quarter of robust growth thanks to feverish demand for its high-powered chips that are making computers seem more human. Nvidia's shares jumped 6.6% in afterhours trading.

Like Nvidia, Macy's stock also swung up and down through much of the day, even though it reported milder drops in revenue and profit for the latest quarter than analysts expected. Its stock ended the day down 0.3%.

The bond market showed relatively little reaction after the Federal Reserve released the minutes from its latest meeting earlier this month, when it left its benchmark lending rate alone for the third straight time. The central bank has been holding off on cuts to interest rates, which would give the economy a boost, amid worries about inflation staying higher than hoped because of Trump's sweeping tariffs.