Investors brace for a surge in oil prices, pressure on stocks and volatility across financial markets after the U.S. bombs Iran's nuclear sites.

Stock indices across Australia, Japan, Korea, mainland China, Hong Kong and Korea fell up to 0.90 per cent. Gift Nifty was down 21 points or 0.08 per cent at 25,001.50, hinting at a muted start for the market.

Dow Jones futures, the S&P 500, and Nasdaq futures are expected to open on Sunday evening following President Donald Trump's announcement that the U.S. had conducted airstrikes on three Iranian nuclear facilities.