European stocks sag as China, Ukraine concerns mount
* FTSEurofirst 300 dips 0.8 pct, Euro STOXX 50 down 0.5 pct
* Both benchmark indexes hit one-month lows
* Russia-exposed stocks hit again as sanctions talk builds
* Europe big winner of emerging market exodus -Amundi CIO
By Blaise Robinson
PARIS, March 12 (Reuters) - European shares fell on Wednesday, sending benchmark indexes to one-month lows, as mounting worries over China's economic growth rate and persistent tensions in Ukraine spooked investors.
Shares in exporters were among the hardest hit, with German conglomerate Siemens down 1.4 percent and BASF , the world's fifth-largest agrochemicals and seeds maker, sliding 1.2 percent.
A sharp sell-off in metal prices - with copper prices plumbing levels not seen since July 2010 - also weighed on mining stocks, with Glencore Xstrata falling 1.3 percent.
Copper's slump followed China's first domestic bond default which has sparked worries of a possible unravelling of the many loan deals which have used the metal as collateral. Continuación...