Every big deal there is commission as % for years after a deal.(eg:Saudi Prince got commission for deal with Britian).This nuclear deal is one sort of this thing although it supplies enery for growing India.
During the main deal making these highly confidential side deals are also made.It may be 1% or less than of eg(100-200 million dollars).
In the meetings between left and right this commision % makes the assess burn.
Some people are really good in making economic policies.3 times food for a normal man and 1% of those millions in his account.