Discounts for Russian flagship Urals crude in Indian ports have tripled since August against dated Brent as U.S. sanctions drive key buyers away from Moscow-supplied oil, three sources involved in the trade said.The United States last month imposed its toughest sanctions yet on Russiaās energy sector, targeting oil majors Lukoil and Rosneft. Friday marks the deadline for companies to wind down all dealings with the two producers.Urals crude has been a mainstay feedstock for Indian refiners since 2023, when Moscow redirected flows to Asia after the European Union banned Russian energy.