The international agreements leading to the ISS are quite complicated. Leaving Russia aside, each of the international partners brought significant assets to the group - Japan, a cluster of lab modules + resupply missions, ESA, a large lab module + resupply missions, Canada, the ISS robotics system. In the 80s when all this was being hammered out, was India a player in human space flight?
This piqued my curiosity, and putting aside my inherent bias, I would like a factual answer of what the Soviet Union and Russia brought to the ISS and the ISS project.
It would also be great if your answer were to also clearly delineate between the USSR and RF.