The leaders of Japan, China and South Korea have begun a trilateral summit in Tokyo expected to focus on Japan's nuclear crisis.
Chinese Premier Wen Jiabao and South Korean President Lee Myung-Bak are due to reaffirm support for Japan following March's earthquake and tsunami.
The disasters triggered a crisis at the Fukushima nuclear plant where workers are still battling a radiation leak.
Earlier, the visiting leaders toured the area near the stricken plant.
They also met disaster victims at an evacuation centre in the north-eastern town of Natori.
Nuclear safety, co-operation in disaster preparedness and food safety are expected to top the agenda at the Tokyo summit, along with trade issues.
Japanese Prime Minister Naoto Kan is also expected to raise trade regulations on Japanese food.
Correspondents say he will also pledge to share information on the nuclear accident with the international community.
Japan's neighbours have expressed concern over the nuclear leak and its impact on food safety across the region.
Mr Wen and Mr Lee are the first foreign leaders to visit Fukushima - about 220km (136 miles) north-east of Tokyo - since the disaster.
On Saturday, Mr Lee said South Korea would do all it could to help reconstruction work in Japan.
The trilateral summit was first held on a regular basis in 2008.
The massive earthquake of 11 March and the ensuing tsunami left more than 24,000 people dead or missing.
source : bbc.co.uk
