Paris: India and France today finalised a landmark agreement on civil nuclear cooperation that covered supply of reactors and atomic fuel in the first concrete step to bring New Delhi back into the nuclear mainstream ending 34 years of nuclear isolation.

The agreement to be initialled later on Tuesday after summit talks between Prime Minister Manmohan Singh and French President Nicolas Sarkozy will form the basis of wide ranging bilateral cooperation from basic and applied research to full civil nuclear cooperation including reactors and fuel supplies, nuclear safety, radiation and environment protection and nuclear fuel cycle management.

The atomic pact comes three weeks after India got the crucial NSG waiver that cleared the decks for New Delhi’s global nuclear trade.

The atomic pact is one of the three agreements to be signed during Singh’s two-day visit to Paris. The other two relates to social security matters which will benefit Indian and French nationals staying in each others countries on short duration up to five years.