By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- A stepped up warning from the U.S. to Russia about the Ukraine crisis was among the factors pressuring European stocks on Friday.

The Stoxx Europe 600 index fell 0.4% to 334.67, as investors headed into the weekend with U.S. Secretary of State John Kerry late Thursday accusing Russia of violating its commitment to easing tensions in eastern Ukraine.

"If Russia continues in this direction, it will not just be a grave mistake, it will be an expensive one," Kerry said, citing growing outflow of capital from Russia in recent months. "It's a preview of how the free world will respond."

An overnight move "that will heighten concerns about the financial impact of the conflict in eastern Ukraine," was Standard & Poor's Ratings Services putting Russia in line for a possible further rating downgrade, said Richard Perry, market analyst at Hantec Markets, in a note. S&P also cut its rating on Russia to one notch above junk.

Germany's DAX 30 was pushed lower, by 0.9% to 9,460.89, as Germany has a deep goods-trading relationship with Russia. Russia's blue-chip MICEX index fell 0.9% to 1,288.47.

The U.K.'s FTSE 100 gave up 0.2% at 6,688.67 and France's CAC 40 lost 0.3% to 4,464.44.

Among movers, shares of Tullow Oil PLC fell 2.7% after the company said it will abandon an exploration well in Mauritania because of a lack of discovery of hydrocarbons.

French auto maker Peugeot SA said its quarterly sales rose, but its shares turned lower in mid-morning trade by 1.7%.

Also in France, shares of Alstom SA were halted, fulfilling a request from the country's market authority AMF, according to exchange operator Euronext Paris. Alstom shares on Thursday rallied 10.9% following a report by The Wall Street Journal that General Electric Co. (GE) is in talks to buy Alstom's energy business.

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