A quiet long-running border dispute between two nuclear-armed superpowers - India and China - has been threatening peace in Asia. Tens of thousands of troops, from either side, have been stationed along the boundary, with clashes in recent years. But with India's Prime Minister Narendra Modi chasing a third term in office, his decision to send more troops there and his visit to a disputed border region has angered China's President Xi Jinping and sparked a war of words that has caught the attention of the United States. Rani Hayman reports.

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