New Delhi, Jan. 1 -- The Indian Navy is set to commission a submarine and two warships into service in Mumbai on January 15, with the new platforms boosting its operational capabilities and combat readiness in the Indian Ocean Region, a strategic maritime expanse where the challenges include China's carefully calculated power play for influence and defending the rules-based international order, officials aware of the matter said on Tuesday. The platforms that will enter service include Vagsheer, the sixth and final Kalvari-class submarine; Surat, a destroyer; and Nilgiri, a frigate. P8...