The deal for the aircraft, the first fighter jet deal in 20 years, will be signed tomorrow in the presence of Defence Minister Manohar Parrikar and Drian, sources in Defence Ministry said.
Also present will be the chief executive officers (CEOs) of top French companies, including Dassault Aviation, the makers of Rafale.
The deal comes with a saving of nearly 750 million Euros than the one struck during the previous UPA government, which was scrapped by the Narendra Modi government, besides a 50 per cent offset clause.
The features that make the Rafale a strategic weapon in the hands of IAF is its Beyond Visual Range (BVR) Meteor air-to-air missile with a range in excess of 150 km.
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Its integration on the Rafale jets will mean IAF can hit targets inside both Pakistan and across the northern and eastern borders while staying within India's territorial boundary.
However, Pakistan later acquired 80-km-range BVR, but now with 'Meteor' the balance of power in the air space has again tilted in India's favour.
'Scalp', a long-range air-to-ground cruise missile with a range in excess of 300 km also gives IAF an edge over its adversaries.
Sources said the "vanilla price" of just the 36 aircraft is about 3.42 billion Euros. The armaments cost about 710 million Euros while Indian specific changes, including integration of Israeli helmet-mounted displays, will cost 1,700 million Euros.