By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks dropped Monday, with the pan-European benchmark slipping from its first weekly advance in nearly a month as investors considered mixed regional economic readings.

The Stoxx Europe 600 index declined 1.1% to 324.39, relinquishing a portion of last week's gain of 1.8%, the first weekly advance in nearly a month.

The composite purchasing managers' index for the euro zone from market-research firm Markit came in at 53.2 for March, down slightly from the previous month's reading of 53.3 but still showing an expansion for the ninth straight month.

Weakness in the markets followed data overnight from HSBC that its preliminary China manufacturing Purchasing Managers' Index for March fell to an eight-month low, missing a consensus forecast and showing further contraction in the sector. Asian stocks finished higher as investors appeared to anticipate that Beijing will introduce a series of policy measures to stabilize growth.

But in Europe, it "seems the markets are reacting more to the negativity of numbers rather than the potential cash injection," said James Hughes, chief market analyst at Alpari Ltd. in London, in a note Monday.

European stocks held to losses after Markit's initial PMI for the U.S. fell to 55.5 from 57.1 in February, though the report still showed improving conditions for manufacturers. On Wall Street, the S&P 500 index (SPX) turned lower by roughly 1%.

In country-specific moves, Germany's DAX 30 index fell 1.7% to 9,188.77, with Markit's report that private-sector activity in Germany unexpectedly slowed in March. Mail-delivery company Deutsche Post AG rose 1.7%, the only one of the DAX's 30 components to finish higher.

Deutsche Lufthansa AG shares declined 3% after pilots at the airline on Friday voted to strike as part of a rift with the carrier over pay.

France's CAC 40 index gave up 1.4% to 4,276.34, although economic data brightened, with Markit saying France's private-sector output in March expanded to a 31-month high. In French local elections on Sunday, the far-right National Front party made gains, in a sign of discontent with Socialist President François Hollande.

The U.K.'s FTSE 100 index fell 0.6% to 6,520.39, as Vodafone Group PLC pulled back by 2.2%. However, gainers included Lloyds Banking Group , up 1.5% after its shares were upgraded to buy from hold at Investec. There's "reasonable value" for the low-risk stock after a 10% decline over 10 weeks, said Investec.

Russian stocks measured by the Micex Index moved down 0.5% to 1,298.77, sitting with a year-to-date decline of nearly 14% as investors have fled the market in response to pro-Russian forces occupying Ukraine's southern Crimea region. U.S. President Barack Obama arrived in Europe on Monday, and will spend part of his week-long trip urging European allies to enact tougher sanctions against Russia.

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