By Anora Mahmudova and Carla Mozee, MarketWatch

Kate Spade, Intercept shares jump

NEW YORK (MarketWatch) -- U.S. stocks opened lower Tuesday as investor optimism sagged amid tension between Ukraine and Russia and lingering concerns about sectarian wars in the Middle East.

Investors are waiting for a monthly report on job openings for clues to the pace of economic recovery in the U.S.

The S&P 500 (SPX) opened 3.5 points, or 0.2%, lower at 1,933.45. The Dow Jones Industrial Average (DJI) lost 30.31 points, or 0.2%, to 16,542.08 at the open. The Nasdaq Composite (RIXF) began the day down 6.5 points, or 0.1%, at 4,395.36.

Geopolitical news took a center stage on Tuesday, undermining the optimism among global investors. Haven assets, such as U.S. Treasurys and gold were higher, while equities suffered.

Tensions between Ukraine and Russia escalated after Russian sent a convoy carrying aid for eastern Ukraine on Tuesday. Kiev said it would not allow the vehicles to cross onto its territory, claiming the convoy was carrying military gear in the guise of aid.

Meanwhile, clashes between ISIS and Kurdish forces continued.

In economic news, the Bureau of Labor Statistics will release its June job openings and labor turnover survey, or JOLTS, at 10 a.m. Eastern Time. Federal Reserve Chairwoman Janet Yellen often cites the survey when she assesses the state of the labor market.

Details will include the number of workers who were hired, fired or laid off, or who quit their jobs, in June. JOLTS data for May showed monthly job openings hit 4.6 million, compared with 4.3 million when the recession started at the end of 2007.

The National Federation of Independent Business's gauge of small businesses, released early Tuesday, showed sentiment edged higher in July. Small businesses account for the bulk of U.S. employment.

Stocks rose Monday, led by small-cap stocks, in what was described as a relief rally after the selloff over the past two weeks. Equities have been under pressure on concerns the Fed will raise interest rates sooner rather than later as well as on broader worries about a trade war between Russia and the West. The Russell 2000 (RUT), an index of small-cap companies, closed up 0.9%, and the S&P 500 (SPX) ended 0.3% higher.

Stocks in focus

Shares of Kate Spade (KATE) soared 9% Tuesday, putting them on track to open at the highest level seen since April 2007, after the handbags and accessories maker reported better-than-expected second-quarter profit and sales.

Shares of Intercept Pharmaceutical (ICPT) leapt 49%, after the company late Monday issued positive data about an experimental treatment for liver disease.

Flowers Foods shares (FLO) stumbled 6.1% after disappointing quarterly results and yearly forecast from the bakery goods company, whose brands include Nature's Own.

Tesla Motors (TSLA) was off 0.1%. Consumer Reports magazine said its long-term ownership of the Tesla Model S electric car has been mostly positive, but there have been several reliability problems with the car, echoing a similar result from Edmunds.com.

Apple shares (AAPL) edged up 0.3%, following a Bloomberg report that production of new iPad models has begun. (Read more about the day's notable movers here: http://www.marketwatch.com/story/tesla-kate-spade-are-tuesdays-stocks-to-watch-2014-08-12.)

German stocks stumble, gold rises

Elsewhere, Germany's DAX 30 index fell after key ZEW economic-sentiment figures came in sharply lower than anticipated. Those expectations "were understandably low, given the data over the last few months and the deteriorating trade relationship between Europe and Russia," said Craig Erlam, market analyst at Alpari UK, in emailed comments.

Oil futures (CLU4) fell nearly $1 a barrel, turning lower after the International Energy Agency said world oil demand will rise less than previously thought this year. The IEA also said there's ample supply of oil for the market.

Gold futures (GCZ4) gained $4.6 an ounce. Asian markets were mixed, with Japan's Nikkei Average up 0.2%.

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