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GLOBAL MARKETS-Stocks dip as U.S. stimulus underwhelms and coronavirus angst lingers

* Euro STOXX 600 rebounds, U.S. stocks lag

* Sterling falls on new COVID-19 variant, stalled trade talks

* Dollar index rises but faces 3rd straight quarterly loss

* Graphic: 2020 asset performance tmsnrt.rs/2yaDPgn

* Graphic: World FX rates in 2020 tmsnrt.rs/2egbfVh

NEW YORK, Dec 22 (Reuters) - Lingering concerns over a new variant of COVID-19 in the United Kingdom weighed on a gauge of global equities on Tuesday and sent the euro, pound and Treasury yields lower.

The benchmark U.S. S&P 500 stock index dipped in choppy trade, despite the U.S. Congress’s passage of an $892 billion coronavirus aid package.

Some investors said that the fiscal stimulus had already been priced into U.S. equities, while other observers considered the package underwhelming.

“There were probably hopes that there would be something bigger,” said Michael Purves, chief executive of Tallbacken Capital Advisors. “There’s a good chance the economy will need another package.”

The sluggishness in U.S. stocks offset a rebound in European stocks, which had been pummeled on Monday as fresh coronavirus concerns mounted. The pan-European STOXX index, up 1.17%, was on pace to log its biggest one-day percentage gain in more than five weeks.

As a result of the U.S. declines, MSCI’s index of global stocks slipped. It was last down 0.09%.

On Wall Street, the Dow Jones Industrial Average fell 96.58 points, or 0.32%, to 30,119.87, the S&P 500 lost 2.43 points, or 0.07%, to 3,692.49 and the Nasdaq Composite added 39.71 points, or 0.31%, to 12,782.22.

U.S. Treasury yields also fell as investors weighed the likelihood of increased lockdowns in response to the new COVID-19 variant. Benchmark 10-year Treasury notes last rose 3/32 in price to yield 0.9313%, from 0.941% late on Monday.

Among currencies, the euro and the pound dropped, in part on expectations that such restrictions could weaken Europe’s economic outlook. On Monday, countries across the world shut their borders to Britain because of fears over the new variant.

The euro was last down 0.57% to $1.2172, while the pound was last trading at $1.3332, down 1.03%.

The risk-off sentiment in currency markets propped up the dollar index, which rose 0.55%. Even so, the index was still on course for a third consecutive quarterly loss.

Oil markets also reflected sustained worries over the new coronavirus variant. Both Brent and U.S. crude fell more than 1%.

Still, some investors maintained hope for a strong economic recovery in 2021, given expectations that vaccines would be effective against the new variant of COVID-19.

The new mutation “is a bump in the road, but that road is still leading to a much stronger recovery in the second half of next year,” said Hugh Gimber, global market strategist at J.P. Morgan Asset Management.

Stalled trade talks between the European Union and the UK also weighed on sterling. European Commission President Ursula von der Leyen and British Prime Minister Boris Johnson spoke on disagreements over fisheries that are barring a new trade deal, sources said.

Analysts remained pessimistic on the pound’s prospects, even after reports of progress in Brexit trade talks.

MUFG said in a note to clients it expected London and Brussels would strike a last-minute deal, but added: “Even if a trade deal is reached, upside potential for the pound will now be dampened by recent negative COVID developments in the UK.”

Reporting by April Joyner; additional reporting by Tom Wilson in London; editing by Larry King and Philippa Fletcher

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