After three days of global market turmoil not seen since the early days of the Covid-19 pandemic, stocks regained a measure of calm on Tuesday despite little letup in the escalating trade tensions caused by President Trump’s tariffs.

The S&P 500 gained more than 3 percent in early trading, regaining some ground after a brutal three-day slide that at one point on Monday pulled the benchmark close to a bear market, or a drop of 20 percent or more from its recent high. The index remains about 15 percent below the level set just before Mr. Trump announced sweeping tariffs on major U.S. partners last week.

Before markets opened in China, the government unleashed a series of measures to stabilize stocks. In turn, share prices in Hong Kong, a day after plunging 13.2 percent, and in mainland China jumped about 1.5 percent.

Stocks in Japan gained 6 percent, recouping a portion of the previous days’ losses. But markets in Taiwan continued to drop on Tuesday, and after the close of trading the finance ministry there said it would activate a $15 billion stabilization fund to steady the markets.

The Stoxx Europe 600 gained 3 percent, with nearly every major market in the region in the green. The pan-European benchmark remains about 15 percent lower than its peak in early March.

Stéphane Boujnah, the chief executive of Euronext, which runs several stock exchanges across Europe, said in an interview on French radio that the disruption caused by tariffs had made the U.S. markets “unrecognizable” to investors, who were shifting some of their money to Europe from the United States.

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