India bought oil from the UAE using rupees instead of USD for the first time
finance.yahoo.com
finance.yahoo.com
Dollarised oil payments system, US dollar as global reserve currency, balance-of-payments, US access to global credit, control and centralisation over international payments systems such as SWIFT.
Non-dollarised oil payments arise every few years, and usually seem to rapidly become less attractive to all parties. The US is seen as having a strong interest in preventing widespread emergence.