The two sides have agreed to ramp up defence ties, and the Indian Navy is likely to get access to the port at Sabang island.
By stating its intention to do business with Iran, India believes it is asserting its strategic autonomy.
According to a story in The New York Times, a group of researchers have uncovered evidence of a long-range rocket programme in Iran.
By landing an H-6K strategic bomber on Woody Island, China is sending both military and political signals.
America’s withdrawal from the Iran deal could give Delhi some leverage in oil price negotiations with Tehran, but it’s even more likely to trigger a series of diplomatic headaches for India.