* Treasury yields rise after Fed to take 80 pct stake in AIG
* Crude up $3, yen drops as some risky assets bought back
* Systemic risk curbed for now by Fed prop up of AIG
By Kevin Plumberg
HONG KONG, Sept 17 (Reuters) - Asia stocks rebounded and oil extended gains to more than $3 a barrel on Wednesday after the Federal Reserve said it would take over American International Group in a dramatic about-face as victims of the financial crisis kept piling up.
The Fed will provide AIG <AIG.N>, once the largest insurer in the world, a bridge loan of $85 billion and take an 80 percent stake in the ailing company, shouldering the U.S. taxpayer with more liabilities following the government takeover of Fannie Mae and Freddie Mac about a week ago.
After reports about the plan surfaced, investors bought back equities and U.S. dollars while selling the government bonds they had accumulated in the wake of Lehman Brothers' <LEH.P> chapter 11 filing on Monday. However, the stock market rally across the region was still rather tame.
"I expect the markets will be a bit better today but that's after a very rough period," said Peter Hilton, head of Asia equity research with Royal Bank of Scotland in Hong Kong. "People were a bit worried about their effective savings. So relieving that pressure helps some," he said.
Japan's Nikkei share average <
> rose 2.1 percent after closing at a three-year low on Tuesday. Shares of Japan's top bank Mitsubishi UFJ Financial Group <8306.T> outperformed the broad market, rising 2.3 percent.The MSCI Asia-Pacific ex-Japan stocks index <.MIAPJ0000PUS> rose 2.4 percent after hitting a two-year low on Tuesday. It is down 36 percent so far this year.
The rescue of AIG is the latest event in what has already been one of the most tumultuous weeks in the history of finance that has changed the face of the U.S. banking sector. Merrill Lynch <MER.N> agreed on Monday to be bought by Bank of America <BAC.N> for $50 billion.
Investors knocked the MSCI All-Country World equities index <.MIWD00000PUS> to the lowest since December 2005 on Tuesday as a flight from anything resembling risk in markets reached a fever pitch. The driving fear was a bankruptcy by AIG would trigger a catastrophic chain reaction of defaults in the global credit market.
AIG shares have plunged 94 percent year-to-date.
"If AIG had gone belly up, you would have an unknown, humongous number of default swaps cut off. What would that lead to? We were already approaching some market disruption," said Dan Fuss, vice chairman of Loomis Sayles in Boston. "This is a huge relief to many parts of the financial markets."
The U.S. dollar rose 0.8 percent against the yen to 106.20 yen <JPY=> after sinking to a four-month low of 103.54 yen on Tuesday. The euro <EUR=> was up 0.7 percent at $1.4212, boosted mainly by the 15-nation currency's 1.5 percent recovery against the yen to 150.97 yen <EURJPY=>.
Two-year Treasury notes <US2YT=RR> fell 12/32 in price, driving yields up to 1.99 percent, from 1.79 percent late in New York on Tuesday. Yields on 10-year notes <US10YT=RR> rose to 3.56 percent, from 3.44 percent.
The November U.S. light crude future was up $3.20 to $94.35 a barrel <CLc1> after hitting a seven-month low on Tuesday. (Editing by Lincoln Feast)