By Victor Reklaitis, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks extended their weekly decline on Wednesday, joining in a global sell-off and putting the S&P 500 on pace to stretch its losing streak to three straight sessions.

Analysts attributed the worldwide selling of equities to worries about China's slowdown and continued Russia-Ukraine tensions.

The S&P 500(SPX) was last down 3 points, or 0.2%, to 1,864, leaving the benchmark index 0.7% off its record close on Friday.

The Dow Jones Industrial Average(DJI) lost 27 points, or 0.2%, 16,325, also dropping for the third day in a row.

The Nasdaq Composite(RIXF) edged down 2 points, or less than 0.1%, to 4,306, losing ground for the fifth straight session.

All three main indexes have picked themselves up off session lows hit in Wednesday's first half hour of trading, when the S&P was down 0.7%

Asian markets closed lower on Wednesday, with Japan's Nikkei benchmark and Hong Kong's Hang Seng shedding 2.6% and 1.7%, respectively. The Stoxx Europe 600 was last down 1.1%, setting that index up for its lowest close in a month.

"Economic slowdown in China and geopolitical tension between Russia and Ukraine are the major hurdles for the markets," said Naeem Aslam, chief market analyst at Ava Trade, in emailed comments on Wednesday. A much weaker-than-expected decline in Chinese exports rocked markets at the start of the week and has continued to inspire worries. Meanwhile, leaders of the Group of Seven nations warned Russia on Wednesday not to annex Ukraine's Crimean region.

Beyond China and Russia-Ukraine concerns, reasons for the global slump could include a strengthening euro and fresh questions about Japan's stimulus measures, said Peter Boockvar, chief market analyst at the Lindsey Group, in a note on Wednesday. He said the "2014 global market action in its early stage has a definite different complexion than the easy ride up the chairlift in 2013."

Boockvar noted that many major European and Asian stock markets are at or below their closing lows on March 3, "when markets finally reacted lower to Putin's war games," referring to Russian President Vladimir Putin. Copper, a proxy for global growth, also has slumped, he added.

High-grade copper(HGK4) for May delivery has traded below $3 a pound this week, a level not seen by the metal since July 2010. (Read more: China's role in copper's slide: Why investors should care http://blogs.marketwatch.com/thetell/2014/03/12/chinas-role-in-coppers-collapse-why-investors-should-care/.)

A "fear factor" is "creeping" into markets, but there is also a lack of catalysts, and U.S. stocks aren't far off from their recent highs, said Peter Cardillo, chief market economist at Rockwell Global Capital.

"We're not collapsing," Cardillo told MarketWatch. "Basically, we have no economic numbers to speak of today, and the market is just following the international markets."

The U.S. economic calendar is empty on Wednesday, leaving investors to look ahead to Thursday's reading on retail sales, as well as next week's Federal Reserve meeting. In overseas economic news on Wednesday, a reading on euro-zone industrial production showed a decline of 0.2% in January, missing expectations for an increase and contributing to negative sentiment.

Among individual stocks, VeriFone Systems Inc.(PAY) jumped 12%. Late Tuesday, the maker of electronic payment devices reported a fiscal first-quarter loss but it also guided second-quarter revenue above Wall Street's forecasts.

On the downside, Express Inc.(EXPR) shed 10% after the clothing retailer said fourth-quarter earnings fell 25% due to extensive promotions and discounting. (Read more in the Movers & Shakers column http://www.marketwatch.com/story/oxigene-doubles-fannie-and-freddie-extend-fall-2014-03-12.)

More from MarketWatch:

Kellner: 5 reasons why stocks will fall

Never forget the market crash: Be an elephant, not a bull

Bogle critiques Klarman's call, backs 'buy and hold'

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