What is the total amount of defense order that the USA has bagged from India in billions during Obama and Trump's presidency?
How does it compare to the Indo-Russian contract during the same time?
Over the preceding decade, the US has become India’s biggest defence supplier with $15 billion in sales of C-17 Globemaster III and C-130J Super Hercules transporters, P-8I Poseidon maritime surveillance aircraft, CH-47F Chinook heavy lift choppers and AH-64E Apache attack helicopters.
Couldn't get figures for deals with Russia for the range duration but from http://m.timesofindia.com/india/India-Russia-ink-pacts-that-will-lead-to-defence-deals-worth-Rs-72000-crore/articleshow/54871603.cms (article of 15 Oct 2016):
Correcting the pronounced tilt towards the US in defence deals over the last decade, India on Saturday inked pacts with Russia to acquire advanced air defence missile systems, stealth frigates as well as jointly produce light-utility helicopters. The three projects are collectively worth an estimated $10.5 billion (over Rs 72,000 crore).
There are most likely more deals with Russia earlier than these three, but as per the first source US is leading with $15 billion.
The United States of America (US) has leapt ahead of Russia as India’s biggest supplier of new weaponry. A recent report from Parliament’s Standing Committee on Defence reveals that, during the last three years, US firms concluded 13 contracts with India, worth Rs 288 billion. In the same period, Russia got 12 contracts, valued at just Rs 83 billion – not even one-third of the US bag.
A look at the trend over the years, which indicates that USA started taking over Russia 2015 onwards: Source: http://ajaishukla.blogspot.in/2018/05/india-caught-in-crossfire-as-us.html