European markets have opened mostly flat, as traders refrained from taking major bets amid escalating tensions over the Ukrainian crisis and ahead of the release of some key European economic data.

Closer home, data showed that GfK consumer confidence strengthened more-than-expected in August while Nationwide house prices rose at a faster than expected pace this month. Looking ahead, market participants will keenly eye the release of Eurozone unemployment rate and consumer price inflation data, a key indicator for the European Central Bank to decide its future policy action. Additionally, consumer sentiment data in the US will be tracked for further guidance.

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