Event 1: China's 1962 Invasion
The initial event was China's large-scale invasion in 1962, resulting in a short border war between China and India.
Event 2: Aksai Chin Annexation
Following the invasion, China took control of the Aksai Chin area, a territory contested by both India and China. This seizure significantly impacted their bilateral relationship.
Event 3: Resumption of Diplomatic Ties
After years of tense relations, especially post-1962 war, full diplomatic relations between India and China were re-established. Diplomatic communication was reopened to stabilize the relationship.
Event 4: Prime Minister Vajpayee's Visit
In 2003, India's then-Prime Minister, Atal Behari Vajpayee, made the first high-level Indian visit to China since the restoration of diplomatic relations. This visit marked a significant milestone in India-China diplomacy.
Event 5: Conclusion
Therefore, the correct chronological sequence is (A), (D), (B), (C).