This chart shows the competition between India and China's submarine fleet

China and India, the world's two most populous states, share the world's longest contested land border. The two nations also have the dubious distinction of being the largest weapons importers on earth.

Although China and India have attempted to improve relations, the two countries remain locked in a geopolitical struggle for influence. This competition has become especially apparent in Chinese and Indian designs for the Indian Ocean.

Both nations are aggressively seeking to expand their projected maritime power in the region, especially through the use of submarines. The following Reuters chart compares their submarine fleets.

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