Big changes in the neighborhood are giving the government in New Delhi more than a few sleepless nights. Buoyed by an $11 trillion economy and plans to connect Eurasia with its ambitious Belt and Road Initiative, China is showing up in areas that India has traditionally viewed as its backyard. Around South Asia and the Indian Ocean, New Delhi has long understood the imperative of preventing another neighbor from allying with a rival military power (as Pakistan has done with China), as well as the need to earn the support of regional governments to help resolve bilateral irritants and expand trade to bolster the country's $2 trillion economy....