By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.S. stock futures pointed to a lower market open Thursday, as attention turned to tensions between Russia and Ukraine.

Shares of Morgan Stanley could gain after the banking giant's quarterly results outstripped expectations. But both Mattel and AutoNation were suffering following disappointing earnings.

Investors on Thursday will also assess a weekly labor-market update as well as a speech on monetary policy by a Federal Reserve official.

Futures for the Dow Jones Industrial Average (DJU4) fell 50 points, or 0.3%, to 17,007, while those for the S&P 500 index (SPU4) dropped 11 points, or 0.5%, to 1,964. Futures for the Nasdaq 100 index (NDU4) gave up 23 points, or 0.6%, to 3,900.

A drop in futures accelerated following reports a Ukrainian fighter jet was shot down by missiles from a Russian plane. The National Security and Defense Council of Ukraine said the incident took place late Wednesday.

On Wednesday, the U.S. unveiled a new round of sanctions against Russia, targeting companies such as oil giant Rosneft and Gazprombank ONO. The European Union said it will detail new sanctions against Russia by the end of this month. European stocks fell sharply on Thursday. Read: Russian stocks pounded after U.S. imposes new sanctions.

Ahead of the bell, shares of Morgan Stanley (MS) gained more than 2% after the company's profit and revenue for the second quarter beat Wall Street's projections.

UnitedHealth Group (UNH) shares climbed 1.2% after the largest health insurer in the U.S. reported better-than-expected second-quarter results. It also raised its 2014 revenue projection.

Mattel (MAT) shares sank 10% as quarterly earnings were dragged lower by muted sales of Barbie dolls.

SanDisk (SNDK) shares fell 8% after the flash-memory maker's third-quarter revenue forecast was lighter than anticipated. Read more about the day's notable movers here.

Investors will monitor comments from St. Louis Fed President James Bullard, who is slated to speak in Kentucky about monetary policy at 1:35 p.m. Eastern Time. Bullard said in a Bloomberg interview last week that a continued decline in U.S. unemployment could push inflation above the Fed's 2% target by the end of 2015. Bullard isn't a voting member of the Fed's policy-making committee.

The Labor Department will release data on weekly jobless claims at 8:30 a.m. Eastern Time. The number of people who applied for unemployment benefits is expected to rise to 310,000 for the week ended July 12, according to economists polled by MarketWatch. Last week, claims fell to a nearly seven-year low.

The Commerce Department's report on June housing starts is due at the same time. Economists expect the seasonally adjusted annual rate to have hit 1.02 million units. Economists say about 1.7 million starts are needed each year to maintain current stock and meet demand for replacement and second homes.

A July reading on activity among regional manufacturers is slated for release at 10 a.m. Eastern by the Federal Reserve Bank of Philadelphia. Economists expect to see the result weaken to 16.5 from 17.8 in June, which was the highest level since September.

After trading closes Thursday, Google (GOOG) is expected to post earnings of $6.25 a share on revenue of $12.3 billion. Read NEED TO KNOW: Janet Yellen might disagree, but Amazon tapped as screaming buy.

In the commodities market, August crude-oil futures (CLQ4) rose $1.32 to $102.52 a barrel, and gold futures (GCQ4) picked up $1.40 to $1,301 an ounce.

Asian stocks overnight closed mixed, with Japan's Nikkei Average down 0.1%.

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