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In January, South Sudan cut off the flow of oil to Sudanese refineries following a dispute with the government in Khartoum. The move crippled the economies of both nations, which rely on oil for a significant portion of their income.

Sen. John F. Kerry, Massachusetts Democrat and chairman of the Senate Foreign Relations Committee, said the South Sudanese government’s decision to shut off the oil may have been justified but also was “self-defeating.”