GLOBAL MARKETS-European shares, dollar weak ahead of Yellen testimony
* European stocks fall, dollar approaches six-month low
* Ukraine crisis, slide in tech stocks weigh on markets
* Focus on Fed Chair Yellen's testimony later
By Carolyn Cohn
LONDON, May 7 (Reuters) - European shares fell and the dollar hovered above six-month lows against a basket of currencies on Wednesday on an overnight drop in U.S. tech stocks and on concerns over the deepening crisis in Ukraine.
Investors were also awaiting congressional testimony from U.S. Federal Reserve Chair Janet Yellen later in the day.
U.S. stock futures were pointing to a lower start on Wall Street, after the tech-heavy Nasdaq index fell 1.4 percent in the previous session.
Twitter shares sank 18 percent to a new low on Tuesday, wiping out more than $4 billion of its market value, as early investors sold stock in the messaging service after a six-month "lock-up" expired.
Easy monetary policy in the developed world is causing market imbalances, analysts said.
"It looks like we're mirroring the past cycles - addressing over-indebtedness problems with more debt, printing money and pushing up asset prices," said Iain Stewart, investment manager at Newton Investment Management.
"Almost certainty we will see bubbles."
Ukraine, which appears to sliding towards war after its deadliest week since a separatist uprising began in its mainly Russian-speaking east, also remains a concern for the markets.
European shares fell 0.25 percent and European tech stocks fell 0.3 percent towards three-month lows, heading for their first five-day losing streak in seven months.
France's No. 2 listed bank, Societe Generale, booked a 525 million euro ($731 million) writedown on the value of Russian unit Rosbank, blaming the months of crisis in Ukraine and the fall in the Russian rouble. Its shares fell 1.4 percent.
Danish brewer Carlsberg, one of Europe's blue-chips with the highest exposure to Russia, fell 0.7 percent. It partly blamed currency volatility in Russia for a fall in its first-quarter operating profit.
Russian stocks rose around 1 percent, however, with local players focusing instead on efforts to find a diplomatic solution to the crisis in Ukraine.
The U.S. dollar index, which measures the greenback against six major currencies, stood at 79.13 after falling on Tuesday to 79.06, its lowest in more than six months.
The dollar weakened to 101.40 yen, its lowest since April 14, before trimming losses slightly, and stabilised at $1.3928 per euro, just above recent eight-week lows.
The immediate focus for the dollar was on Yellen's congressional testimony. The Fed is widely expected to stick to a dovish stance, doing little to arrest the recent fall of the dollar, which has shown little reaction to positive economic data.
"Fed Chair Yellen is likely to dodge any questions pertaining to the specific timing of interest rate rises, given the furore after her suggestion at a press conference in March that rates might rise about six months after asset purchases end," analysts at Capital Economics wrote in a note to clients.
Expectations that the Fed will not raise interest rates soon, in addition to safe-haven bids have kept U.S. Treasury yields low.
The U.S. Treasury 10-year note rose slightly in price to yield 2.5784 percent, after the yield touched a three-month trough of 2.57 percent on Friday.
German Bund futures rose 9 ticks to 144.76, and peripheral debt yields were trading around multi-year or record lows.
German manufacturing orders recorded their biggest decline in 1-1/2 years in March, and French industrial output unexpectedly fell. That may give the ECB another reason to loosen monetary policy, alongside a strong euro and low inflation.
"It raises the likelihood that the ECB will act to address not only the inflation situation, but weak macro-economic data as well," said Alexander Aldinger, an analyst at Commerzbank.
In the commodities markets, oil rose after crude stocks decreased, defying expectations for an increase, with geopolitical risks helping put a floor under prices.
U.S. crude was up 0.78 percent at $100.28 a barrel.
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