India imports 85% of the oil it consumes. A third of that comes from Russia—or used to come from Russia, until last November, when President Trump’s administration sanctioned the top exporters. Now, Washington is doubling down on cutting India’s oil link with Russia, but it may prove tricky for the world’s second-largest importer of oil. “Even though India has reduced its purchase of crude oil from Russia in recent months, it is unlikely to cease all purchases immediately, which could be disruptive to India’s…