In late November in Jamnagar, India, the scions of two of the most powerful families in the world stood face-to-face. On one side was 30-year-old Anant Ambani, son of one the richest men in Asia. On the other was Donald Trump Jr. For months, the Trump administration had been on the offensive against the sprawling Ambani energy empire, placing it at the center of an escalating tariff campaign against India.