By Victor Reklaitis and Sara Sjolin, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks stepped back Thursday after worries about Russian aggression toward Ukraine ramped up again, with the S&P 500 retreating from 2,000 and eyeing an end to its three-day winning streak.

Kiev said Russian forces had entered Ukraine and seized the coastal town of Novoazovsk, and a NATO official said Russia's actions in Ukraine are "more overt now." A stronger-than-anticipated reading on U.S. economic growth failed to push equities higher.

The S&P 500 (SPX) fell 5 points, or 0.2%, to 1,996 after being down nearly 10 points, while the Dow Jones Industrial Average(DJI) shed 58 points, or 0.3%, to 17,064 after being down 104 points. The Nasdaq Composite(RIXF) lost 10 points, or 0.2%, to 4,559.

All three benchmarks remain on track for modest weekly gains. On Wednesday, the S&P 500 and Dow both closed higher for a third straight session, with the S&P holding above 2,000 and nabbing its 31st record close this year.

GDP beats forecasts: The second estimate for second-quarter U.S. gross domestic product indicated expansion of 4.2%. Economists polled by MarketWatch had predicted 3.9% growth in GDP, down from an initial read of 4%.

Weekly jobless claims came in at 298,000, a slightly more encouraging result than expected, and an index that measures how many U.S. homes are ready to be sold jumped to its highest level in 11 months.

What strategists are saying: The U.S. stock market is down partly due to Russia-Ukraine concerns, but a bigger driver could be the upbeat GDP report putting further pressure on the Federal Reserve to hike interest rates, according to Doug Coté, chief market strategist at Voya Investment Management.

He said it's "dangerous" to have a zero-interest rate policy when growth is at 4.2%. "We need to get off a zero-rate policy as soon as possible," Coté told MarketWatch.

Expectations of higher rates could increase volatility in the near term, but the Voya strategist still recommends buying equities and other risk assets, "because ultimately what's raising the prospect of rising rates is strong economic growth," he said.

Movers and shakers: Abercrombie & Fitch Co. (ANF) and Williams-Sonoma Inc. (WSM) dropped 6% and 11%, respectively, after their quarterly earnings reports, while Signet Jewelers Ltd. (SIG) rose 6% in the wake of its results.

Visa Inc. (V) fared worst among Dow components, falling 1% after Raymond James analysts downgraded the credit-card giant to market perform, citing a lack of positive catalysts. TripAdvisor Inc. (TRIP) and Garmin Ltd. (GRMN) were among the S&P 500's bigger decliners, as each stock slid more than 1%.

(Read more about Thursday's jumpiest stocks in the Movers & Shakers column http://www.marketwatch.com/story/workday-williams-sonoma-guess-are-stocks-to-watch-thursday-2014-08-28.)

Other markets: European stocks posted losses as the first country-specific reports on August consumer prices fueled deflation fears and renewed tensions in Ukraine weighed. Asian markets closed mostly in the red.

Oil prices gained, while gold also moved higher. The dollar advanced against most of its rivals.

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