Russia did help India a lot in developing its nuclear capabilities - both for peaceful purposes and for its military. From what I remember reading on the subjec

Russia did help India a lot in developing its nuclear capabilities - both for peaceful purposes and for its military. From what I remember reading on the subject, the US actively helped us in the beginning, in the 60's, and even gave us some nuclear reactors. However, after we used and processed the Uranium from it for our nuclear weapons program, they were pissed and were in the forefront in imposing sanctions on us. They blocked access to a lot of science and tech to hamper our nuclear program, for decades. That is when the Russians increased collaboration on nuclear tech with us. They went even further than the US and even helped us develop nuclear tech for the military - for example, by leasing us a nuclear submarine to our navy (which helped us to build our own nuclear submarines). So yes, Russia has definitely contributed more to India than the US. (And they have done so in a lot of other fields too - India does owe a lot to Russia).