The document summarizes India and China's relationship over time. It discusses how they had diplomatic relations in the 1960s-1970s but relations became strained due to conflicts in 1962 and 1967. Trade relations increased significantly from the 1980s onward, with China becoming India's largest trade partner in 2019. However, relations deteriorated again due to a clash in 2020. Trade volumes have increased rapidly in recent decades but India still faces a large trade deficit with China. Ongoing border disputes and increased military activity have also created ongoing problems in their relationship.