A businessman walks past a restaurant in Tokyo April 4, 2011. Big Japanese manufacturers expect business conditions to worsen in the next three months, responses to a Bank of Japan survey collected after a devastating March 11 earthquake and tsunami showed, as rolling power blackouts and a nuclear safety crisis threaten to delay the country's return to a moderate economic recovery. [Photo/Agencies]

The sarcophagus covering the damaged fourth reactor at the Chernobyl nuclear power plant is seen behind a building decorated with a graffiti in the abandoned city of Prypiat April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26. Engineers are still struggling to regain control of damaged reactors at the Fuskushima plant after last month's earthquake and tsunami, in the worst nuclear crisis since Chernobyl in 1986, with the government urging the operator of the plant to act faster to stop radiation spreading. [Photo/Agencies]