Stocks in Asia were mostly higher Thursday as investors awaited an expected decision by the European Central Bank to unleash new stimulus measures.

Australia's S&P ASX 200 was up 0.6%, while the Nikkei Stock Average was near flat and the Hang Seng Index gained 0.5%. The ECB announcement comes after Asian markets close for the day.

A proposal from the ECB's executive board calls for bond purchases of about EUR50 billion ($58 billion) a month that would last for a minimum of one year, The Wall Street Journal reported. The proposal suggests bond purchases could amount to at least EUR600 billion, in line with forecasts that have centered on a figure of around EUR500 billion or higher.

Crude-oil futures fell 0.8% to $47.41 in Asia trade, pressuring stocks in Malaysia, which fell 0.3%.

In Japan, shares of Toyota Motor were down 0.7% after the company retained its crown as the world's largest car company by sales in 2014, but said it expects to post an overall 1% sales decline in 2015 as a result of softening demand in Japan.

The Bank of Japan on Wednesday cut its inflation outlook, raising doubts about a revival of the nation's economy. The Nikkei slipped 0.5% on Wednesday.

Saumya Vaishampayan contributed to this article.

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