The treaty – Convention on Supplementary Compensation for Nuclear Damage – has been agreed by the US, Romania, Morocco and Argentina, but it needs at least five countries to come into effect, Reuters reported.

Japan will begin talks with the US to discuss the pact, which defines the rules for trials for damage claims in countries where accidents happen.

Japan has taken this decision amid the 11 March 2011 earthquake that caused a huge disaster at the Fukushima Daiichi nuclear power plant, which leaked radiation and exposed wide-ranging produces to excessive radioactive materials.

The treaty will not cover damages related to the accident because it took place prior to its ratification and Japan expects more countries, particularly in Asia where several nuclear power plants are being built, to join such a treaty.