By V. Phani Kumar, MarketWatch

HONG KONG (MarketWatch) -- Asian stocks stumbled Thursday after uncertainty over U.S. monetary policy led to more losses on Wall Street, with Japanese shares plunging toward their sixth loss in seven sessions as a strengthening yen hurt exporters.

The Nikkei Stock Average plummeted 4.4% to 12,710.34 -- dropping back below the 13,000-point level it had recaptured in early April but briefly lost earlier this month -- while the Topix shed 3.3%.

Australia's S&P/ASX 200 fell 0.8% to enter so-called correction territory -- having dropped more than 10% from the highs reached in May. South Korea's Kospi shed 0.3%.

The declines came after U.S. stocks finished lower for a third straight session overnight as concerns the Federal Reserve could taper down its bond purchases and scale back a key force behind the rally in global equities over the past several quarters kept investors on edge.

The losses on Wall Street reinforced "the notion that the market is similar to a junkie who needs a constant fix, which in this case comes in the form of monetary stimulus," said CMC Markets sales trader Miguel Audencial.

"Even a slight indication or the speculation that this stimulus will be scaled down may ignite a sell-off," he said.

In Japan, stocks found little respite as the U.S. dollar (USDJPY) fell further toward the Yen95-level, raising more fears about the earnings outlooks of companies with a significant international presence.

Shares of Fast Retailing Co. (FRCOY) skidded 4.1%, Mazda Motor Corp. (MZDAY) slumped 4.8% and Sharp Corp. (SHCAY) lost 6.7%.

"The combination of elevated risk aversion and disappointment over recent policy announcements, in particular the lack of detail about Prime Minister [Shinzo] Abe's 'third arrow,' has prompted ever more upside for the [yen]" said Crédit Agricole forex strategy chief Mitul Kotecha.

In Sydney, mining stocks came under pressure, with BHP Billiton Ltd. (BHP) lower by 1.7% and Fortescue Metals Group Ltd. (FSUMY) sliding 1.9%.

Rio Tinto Ltd. shares (RIO) declined 1.2%. The company said it plans to sell its Eagle nickel and copper project to Lundin Mining Corp.

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