TOKYO, Sept 21 Stocks in Asia sank and bond yields were elevated on Wednesday, as investors braced for another aggressive interest rate hike from the US Federal Reserve later in the day.

Japan's Nikkei dropped 1.26 per cent and touched a two-week low. Australia's benchmark share index slid 1.35 per cent and South Korea's Kospi fell 0.9 per cent.

Chinese blue chips declined 0.82 per cent, while Hong Kong's Hang Seng lost 1.26 per cent.

MSCI's broadest index of Asia-Pacific shares lost 1 per cent. That follows a sell-off on Wall Street overnight that knocked 1.13 per cent off the S&P 500, although futures pointed to a slightly higher open on Wednesday.

The Fed headlines a week in which more than a dozen central banks announce policy decisions, including the Bank of Japan and Bank of England on Thursday.

Sweden's Riksbank surprised markets overnight with a full percentage-point hike, and warned of more to come over the next six months.

Despite that, bets for Fed tightening stayed stable.

Markets are pricing in an 81 per cent chance of another 75-basis-point increase, and see a 19 per cent probability of a full percentage point rise.

Global yields rose amid expectations of further tightening.

The two-year US Treasury yield hit an almost 15-year high at 3.992 per cent on Tuesday, and remained elevated at 3.9516 per cent in Tokyo trading, while the 10-year Treasury yield touched its highest in over a decade.

It hit 3.604 per cent for the first time since April 2011, and was last at 3.5473 per cent.

Australia's benchmark 10-year yield rose to an almost three-month high of 3.789 per cent, and South Korea's equivalent yield hit the highest since April 2012.

Markets are "seemingly well positioned for a 75 bps hike alongside a hawkish update" from the Fed, Taylor Nugent, a markets economist at National Australia Bank in Sydney, wrote in a client note.

"The post meeting commentary and the updated dots will be key," said Nugent, adding that the NAB was looking for a policy rate of "something like 4 per cent" at the end of this year, with no rate cuts expected until 2024.

The US dollar index, which measures the currency against six major peers, edged a little higher to 110.22, grinding back toward this month's 20-year high of 110.79.

The greenback was little changed at 143.64 yen, after twice trying 145 this month, a level last seen 24 years ago.

This week, the BOJ is set to cement its position as the lone dove among the central banks of advanced economies by sticking to its ultra-accommodative policy that pins the 10-year Japanese government bond yield near 0 per cent.

The bank offered to buy 250 billion yen of bonds in an unscheduled operation on Wednesday to keep yields in check.

Sterling languished around $1.1372, sticking close to Friday's 37-year low of $1.1351.

Markets are split on whether the BOE will opt for a 50- or a 75-basis-point hike on Thursday.

Meanwhile, crude oil continued its decline amid worries that aggressive tightening by the Fed and other central banks would crimp growth and curb demand.

Brent crude futures dropped 26 cents to $90.36 a barrel, after falling $1.38 the previous day.

US West Texas Intermediate crude was at $83.74 a barrel, down 20 cents. The October delivery contract expired down $1.28 on Tuesday, while the more active November contract lost $1.42.

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