In June 2020, India was ‘surprised’ by China’s military actions across the contested Line of Actual Control (LAC) in Ladakh. Lives were lost on both sides. The strained bilateral relationship took another beating and a tense military stand-off ensued. The tactical situation is unresolved and remains brittle a year later, and this is an opportune moment to review the chequered trajectory of Sino-Indian relations since the heady period of the 1950s.