Japan, China and South Korea have agree to cooperate to improve nuclear safety and preparedness for natural disasters.
In a meeting in Tokyo, the leaders of the three nations decided to set up an early warning system to alert each other of emergencies at nuclear facilities.
Workers in Japan are still battling to control the stricken Fukushima Daiichi nuclear plant, which is leaking radioactive material after being struck in the earthquake and tsunami of 11 March.
China and South Korea have been critical of Japan's handling of the crisis in recent weeks. The BBC reports the meeting was designed to show solidarity after the tsunami disaster.
Chinese Premier Wen Jiabao and South Korean President Lee Myung-bak visited the Fukushima district - the first foreign leaders to do so since the disaster.
Japan's Prime Minister Naoto Kan has been keen to highlight that food from his country is not contaminated.
During a photo opportunity on Saturday, Mr Wen and Mr Lee both ate food in the Fukushima prefecture.
