President Donald Trump delivered another jarring reversal in American trade policy Wednesday, suspending for 90 days import taxes he'd imposed barely 13 hours earlier on dozens of countries while escalating his trade war with China. The moves triggered a powerful stock market rally on Wall Street but left businesses, investors and America's trading partners bewildered about what the president is attempting to achieve.

The U-turn came after the sweeping global tariffs Trump announced last week set off a four-day rout in global financial markets, paralyzed businesses and raised fears the U.S. and world economies would tumble into recession.

The stock market was soaring and the sun was shining when President Donald Trump stepped out of the Oval Office on Wednesday afternoon. Less than two hours earlier, he had retreated from his plans to increase tariffs on many U.S. trading partners, and investors were rejoicing after bracing for a global economic meltdown.

"You've got the markets seeing your brilliance," Sen. John Barrasso, a Republican from Wyoming, told the president.

China is reaching out to other nations as the U.S. layers on more tariffs in what appears to be an attempt to form a united front to compel Washington to retreat. Days into the effort, it's meeting only partial success with many countries unwilling to ally with the main target of President Donald Trump's trade war.

Facing the cratering of global markets, Trump on Wednesday backed off his tariffs on most nations for 90 days, saying countries were lining up to negotiate more favorable conditions.

World markets soared on Thursday, with Japan's benchmark jumping more than 9% as investors welcomed U.S. President Donald Trump's decision to put his latest tariff hikes on hold for 90 days, though he excluded China from the reprieve.

In early trading, Germany's DAX initially gained more than 8%. By midmorning, they were up 5.3% at 20,720.86, while France's CAC 40 in Paris gained 5% to 7,204.23. Britain's FTSE 100 surged 4.0% to 7,983.37.

The European Union's executive commission said Thursday it will put its retaliation measures against new U.S. tariffs on hold for 90 days to match President Donald Trump's pause on his sweeping new tariffs and leave room for a negotiated solution.

European Commission President Ursula von der Leyen said that the commission, which handles trade for the 27 member countries, "took note of the announcement by President Trump."

The U.S. Treasury Department on Wednesday issued new sanctions targeting Iran's nuclear program, just days before senior American and Iranian officials are expected to hold talks in the Middle East sultanate of Oman.

Five entities and one person based in Iran are cited in the new sanctions for their support of Iran's nuclear program. The designated groups include the Atomic Energy Organization of Iran and subordinates Iran Centrifuge Technology Company, Thorium Power Company, Pars Reactors Construction and Development Company and Azarab Industries Co.

Manufacturers struggling to make long-term plans. Farmers facing retaliation from Chinese buyers. U.S. households burdened with higher prices.

Republican senators are confronting the Trump administration with those worries and many more as they fret about the economic impact of the president's sweeping tariff strategy that went into effect Wednesday.

By declaring a trade war on the rest of the world, President Donald Trump has panicked global financial markets, raised the risk of a recession and broken the political and economic alliances that made much of the world stable for business after World War II.

Trump's latest round of tariffs went into full effect at midnight Wednesday, with higher import tax rates on dozens of countries and territories taking hold.

Asian and European shares slid on Wednesday, with Japan's Nikkei 225 dipping more than 5%, as the latest set of U.S. tariffs including a massive 104% levy on Chinese imports took effect.

The Nikkei 225 lost 3.9% to 31,714.03. In Hong Kong, the Hang Seng lost 0.4% to 20,041.03, while the Shanghai Composite index reversed early losses, gaining 0.9%. to 3,173.56. Taiwan led losses in Asia, as its Taiex plunged 5.8%.

Elon Musk on Tuesday described Peter Navarro, a senior White House trade advisor, as "truly a moron" and "dumber than a sack of bricks" in a growing rift over Donald Trump's tariff policy.

Musk, a key aide to the president, has signaled opposition to the tariffs, and the Tesla CEO hit out after Navarro described him as "not a car manufacturer" but "a car assembler."