By Victor Reklaitis and Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks extended losses on Wednesday after President Barack Obama warned against "casual indifference" toward Russia over military escalation in Crimea and urged more economic sanctions.

Early morning gains on the back of a strong headline number for durable-goods orders, as well as hopes for additional European and Chinese stimulus measures, had evaporated by midafternoon.

Shares of King Digital Entertainment PLC (KING) slumped at the first day of its trading. The maker of the popular "Candy Crush Saga" game was last down 11% in its first day of trading on the New York Stock Exchange. One analyst said King's debut was hit by "extremely fast money."

The S&P 500(SPX) was last down 4 points, or 0.2%, to 1,861.33. The Nasdaq Composite(RIXF) shed 33.71 points, or 0.8%, to 4,200.53. The tech-heavy index's year-to-date gain of 0.6% is trailing the benchmark's 0.7% gain since the start of the year.

The Dow Jones Industrial Average(DJI) dropped 50.11 points, or 0.3%, to 16,317.09.

Orders for big-ticket items rose 2.2% in February, powered by higher bookings for autos and aircraft. That topped the flat result expected by economists surveyed by MarketWatch. Stripping out the volatile transportation sector, orders rose a smaller 0.2%.

"Once you get beyond the headline number, the details are a bit disappointing," said Anastasia Amoroso, global market strategist at J.P. Morgan Funds. But she added that investors are encouraged, because autos and aircraft orders -- "volatile or not, core or not" -- still do matter and help the economy.

Amoroso also said while this week's economic reports have been mixed, the Federal Reserve continues to signal that it sees overall improvement. "What trumps it all is the Fed's conviction that we are now on the path to a self-sustaining recovery," she told MarketWatch.

Hopes for measures that could boost China's economy as well as speculation of more moves by the European Central Bank were contributing to positive sentiment, according to Peter Cardillo, chief market economist at Rockwell Global Capital.

"The big thing is that yesterday one of the ECB officials indicated they will fight deflation, and so that's a sign of increasing stimulus, and if China and the ECB both begin to increase stimulus, that's an indication that the global economy can perk up and the threat of deflation spreading can be halted," Cardillo said.

Follow MarketWatch's live blog of Wednesday's stock-market action

King Digital is facing skepticism, with some experts describing the company as a "one-trick pony." Amoroso of J.P. Morgan Funds said King Digital's debut is getting attention, but she doesn't see it having a big effect overall on sentiment.

Among other individual stocks, Facebook Inc.(FB) lost 4.2% after the social-media giant said late Tuesday that it's buying virtual-reality goggles maker Oculus VR Inc. for $2 billion.

On the upside, Five Below Inc. (FIVE) surged 13% after posting fourth-quarter results late Tuesday that topped Wall Street estimates late Tuesday. (Read more in the Movers & Shakers column http://www.marketwatch.com/story/five-below-surges-fuel-cell-stocks-inch-lower-2014-03-26.).

Volatile fuel-cell company stocks slumped, with Plug Power (PLUGD) skidding 17%, at one point triggering Nasdaq's short-sale circuit breaker. Ballard Power Systems Inc. (BLDP) plummeted 17% after surging 32% a day earlier, and FuelCell Energy Inc. (FCEL) slid 14% after gaining 20% on Tuesday.

Plug Power had surged 49%, its best daily percentage gain since early January, following a MarketWatch report that it has a major deal in the works.

In other markets, European stocks rose and Asian equities also saw a largely positive session.

Oil (CLM4) prices rose, but gold (GCM4) was slightly lower. The ICE dollar index (DXY), which measures the U.S. unit against a basket of six major rivals, advanced.

More must-reads from MarketWatch:

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