Koenraad Elst goes over Elena Kuzmina's Origin of the Indo-Iranians and finds:
While this is undoubtedly an important book, and as far as I can judge, it is a classic of Andronovo archaeology, but it fails in its primary mission: to show that this culture was the staging-ground for an Aryan invasion of Iran and India. It only assumes that much, but doesn’t demonstrate it.