Asian stocks fell on Monday as US talks aimed at raising the country\'s debt limit fell apart, raising the spectre of a default, although losses were muted on expectations a deal would be reached.
The crisis weighed on the dollar, sending it to its lowest level against the yen since just after the March 11 earthquake in Japan, which prompted an intervention by Tokyo and its G7 partners.
Tokyo closed 0.81 percent lower, giving up 82.10 points to 10,050.01 and Seoul shed 0.96 percent, or 20.75 points, to end at 2,150.48.
Sydney fell 1.58 percent, or 72.5 points, to finish at 4,530.4 while Hong Kong was 0.80 percent lower in the afternoon.
Shanghai tumbled 2.16 percent amid government investment fears following a fatal train crash over the weekend.
With just over a week to go before the US runs out of money to repay its debt, President Barack Obama and his Republican opponents remain deadlocked on talks over a deficit-cutting budget that will allow for more borrowing.
As the August 2 deadline to raise the country\'s $14.3 trillion debt limit looms, there are fears that a default by the world\'s biggest economy will send shudders through world markets that could lead to another global recession.
Obama has described such a scenario as "Armageddon".
However, the two sides are unable to agree on a budget, with the Republicans adamant that savings must come solely from cost-cutting with no tax rises, while the Democrats want some tax rises for the rich and corporations.
There had been hopes last week that a deal was close when Obama threw his weight behind a tentative plan.
But the crisis deepened over the weekend when the man leading Republican negotiations, John Boehner, refused to return calls to Obama, saying that the White House had shifted the goalposts and had made fresh tax-raising demands.
"With just days to go now before the August 2 deadline, investors who had previously written the impasse off as political games are now going to seriously consider the possibility of a default," GFT Global Markets director of global dealing operations Martin Slaney said.
However, despite rising concerns, many traders expect Republicans, Democrats and the White House will reach an agreement to avoid a default.
Dariusz Kowalczyk, a senior economist and strategist at Credit Agricole CIB, told AFP: "With a week still to go, I think the general sentiment is that there could be many solutions. I expect a deal could be reached before August 2."
And IG Markets chief market strategist Ben Potter told Dow Jones Newswires: "We\'re still of the view that the \'too big to fail\' attitude will mean the debt ceiling is raised."
But he added that it was "becoming more evident that it\'s going to take longer than expected and that one side is probably going to have to give up more ground than they had wanted".
On currency markets, the dollar fell as low as 78.12 yen in early trade, the lowest level since March 17 when the greenback slid to the 76-yen range, leading to the intervention.
It recovered to 78.44 yen in afternoon Tokyo trade against 78.52 yen in New York late Friday.
The euro initially slipped after Moody\'s downgraded Greece\'s debt rating further into junk status after last week\'s eurozone deal to bail out the troubled country.
The agency said the plan, which could see Athens in "selective default", set a dangerous precedent for other nations that face trouble in the future.
The single currency regained its strength and was at 112.76 yen, against 112.69, while it was also up at $1.4373 from $1.4357.
Shanghai stocks led the regional losses as traders fretted leaders would cut back on infrastructure investment due to safety fears after a high-speed train collision Saturday that left 36 dead.
"The market has been expecting investment growth to recover in the second half, but the latest accident may prompt the government to overhaul infrastructure projects and slow the pace of investment," Sinolink Securities analyst Xu Wei said.
High-speed railway equipment makers fell sharply, with China CNR tumbling 6.2 percent and CSR falling 6.8 percent.
Oil fell on concerns that demand would fall off in the event of another financial crisis.
New York\'s main contract, West Texas Intermediate light sweet crude for September delivery, sank $1.04 to $98.83 a barrel, and Brent North Sea crude for September dropped 78 cents to $117.89.
Gold opened in Hong Kong at $1,611.00-$1,612.00 an ounce, up from Friday\'s finish of $1,585.00-$1,586.00. The precious metal surged to a record high $1,623.00-$1,624.00 in pre-trade.
In other markets:
-- Taipei fell 0.93 percent, or 81.81 points, to 8,683.51.
Design house MediaTek lost 2.35 percent to Tw$270.5 while Formosa Plastics Corp was 0.9 percent lower at Tw$110.0.
-- Manila closed flat, edging up 2.14 points to 4,480.50.
Property developer Megaworld rose 2.9 percent to 2.86 pesos, SM Investments gained 1.4 percent to 542.50 pesos and Basic Energy also added 1.4 percent to 38.46 pesos.
-- Wellington ended 0.61 percent, or 21.07 points, to 3,428.15.
Telecom fell 1.3 percent to NZ$2.64 while Sky City added 1.9 percent to NZ$3.72.
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