India’s heavy reliance on oil imports is straining the country’s current account deficit as the Iran war drags on, making it difficult for the central bank to steady the rupee despite the aggressive measures it’s taken so far to halt the slide. The Reserve Bank of India took a dramatic step late last week to curb speculation in the foreign-exchange market and cushion the rupee as it slumped to record lows. The move provided only a temporary bump to the rupee on Monday, though, with the currency giving up most of its initial gains.