The forum's first day has already brought us interesting images. In one, the leaders of China and Japan reflect their countries' unease; in another, world leaders dress alike.
Japan shut down all of its nuclear reactors after the triple meltdown at the Fukushima Daiichi Nuclear Power Station in 2011. This plant could be the first to restart.
The milestone inspired a Hello Kitty Con in Los Angeles this week. But the largest fete was in Tokyo, where parent company Sanrio put on a parade and other events.
The sudden eruption in central Japan surprised and stranded hikers, and caused one death. A hiker managed to shoot video of the shocking sight of an immense billowing gray cloud speeding toward them.
More than 20 bodies remain on a Japanese volcano as new tremors force search teams to abandon their efforts. Officials don't yet know precisely how many climbers remain trapped on the mountain.
At least 36 people are feared dead following Saturday's eruption that caught hundreds of hikers by surprise. Another plume of ash and gas has complicated rescue efforts, which again have been halted.
Officials say the hikers were found close to the mountain's peak, in cardiac and respiratory arrest. More than 200 hikers survived Saturday's eruption.
On the first leg of his Asian tour, the president stopped by the iconic sushi restaurant. David Gelb, who directed a documentary about the restaurant, says eating there is amazing and nerve-wracking.