By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets staged broad-based losses on Wednesday as increasing risks of a civil war in Ukraine hit investing sentiment.

The Stoxx Europe 600 index fell 0.3% to 334.91, setting it on track for a fourth straight day in red.

Posting one of the biggest losses in the pan-European index, shares of CGG slid 7.9% after the French geoscience firm posted a decline in first-quarter revenue.

Shares of Commerzbank AG gave up 2.7% after the German lender reported first-quarter profit below analyst expectations.

Carlsberg AS slipped 0.5% after the Danish brewer cut its full-year guidance due to the political turmoil in Russia, which is its single largest market.

More broadly, Russia's standoff with Ukraine was weighing on the trading mood in Europe. U.S. Secretary of State John Kerry on Tuesday urged Russia not to sabotage upcoming presidential elections in Ukraine, warning such an act could be met with further economic sanctions.

"We are not going to sit idly by while Russian elements fan the flames of instability, instead of fulfilling the commitments that we made," he said in Washington after meeting with the European Union's foreign policy chief, Catherine Ashton.

Also on Tuesday, German foreign minister Frank-Walter Steinmeier and French President François Hollande warned Ukraine is close to a civil war after intense fighting in the eastern part of the country earlier in the week.

Russian stocks shook off the uncertainty in Wednesday's trade, with the MICEX index rising 1.1% to 1,333.10. The blue-chip index is still down 11% year-to-date, making it one of worst performing benchmarks in Europe. The ruble (USDRUB) fell against the dollar, with the greenback buying 35.5073 rubles, up 0.2% from Tuesday according to FactSet. Read: Jim O'Neill: short the euro, watch Apple, sell in May

Among other country-specific indexes, the U.K.'s FTSE 100 index fell 0.3% to 6,775.99, while France's CAC 40 index gave up 0.2% to 4,419.46. Germany's DAX 30 index was slightly lower at 9,463.60.

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