By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets posted sharp losses on Monday after tensions in Ukraine escalated over the weekend, when Russia's President Vladimir Putin got parliamentary approval to use armed forces in the country.

The Stoxx Europe 600 index slumped 2% to 331.22, setting it on track for the lowest close since mid-February.

With the slide, the first trading day of March already looks very different from February, when risk gradually returned to the stock markets after uncertainty over emerging markets eased. Europe's benchmark index ended February with the largest percentage gain since July last year, posting a 4.8% monthly advance.

Russia and Ukraine were the main focus in Monday's trade as the crisis between the two countries escalated, with the U.S. and its allies confronting Russia about its latest move to occupy the country. Western powers threatened on Sunday to isolate Putin and punish his nation's economy, demanding Russia withdraws its forces from Ukraine's Crimean region. Tensions remained on Monday, and the Ukrainian State Border Service said in a statement that "Russian special forces have taken control of several border units using brutal physical force and threat of arms and fear-mongering."

U.S. Secretary of State John Kerry made plans to visit Kiev on Tuesday to show support for the country's interim government.

Russia's MICEX index tanked 12% to 1,272.61. Meanwhile, the ruble (USDRUB) dropped to a record low against the dollar and euro, after Russia's central bank unexpectedly raised its interest rate to 7% from 5.5% in response to recent "increased volatility" in financial markets. In Ukraine, the UX index gave up 12.1% to 984.00.

Billionaire investor Warren Buffett said on CNBC, however, he wouldn't sell shares because of the conflict, but, if anything, use it as a buying opportunity.

In Europe, economic data were largely overshadowed by the political jitters. The final euro-zone manufacturing purchasing managers index for February came in at 53.2, better than the "flash" estimate of 53, but below January's 54.

France's manufacturing PMI climbed to a five-month high of 49.7, almost moving above the 50-level that separates expansion from contraction.

The CAC 40 index traded 2.4% lower at 4,302.40, mainly due to the Ukraine concerns. Germany's DAX 30 index slumped 2.8% to 9,420.35, and the U.K.'s FTSE 100 index dropped 1.8% to 6,691.11.

Banks posted some of the biggest losses in indexes. Shares of Société Générale SA gave up 6.7% in Paris, Commerzbank AG lost 5.6% in Frankfurt, and heavyweight HSBC Holdings PLC (HSBC) fell 1.2%.

Investors more broadly also sold other companies with exposure to the Russian market. Metro AG dropped 6.9%, Nokian Renkaat Oyj lost 6.7% and Carlsberg AS gave up 6.1%. Carlsberg shares were also cut to hold from buy by Berenberg.

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