Saudi Energy Minister Khaled Al-Falih and his Russian counterpart Alexander Novak agreed to "act together" to steady the market but stopped short of agreeing to a production freeze.
On the sidelines of the G20 summit in China, the ministers said they will act "together or in cooperation with other oil productions" and agreed to set up a "joint monitoring group" to offer recommendations to prevent price fluctuations.
At about 0300 GMT, the US benchmark West Texas Intermediate was up 84 cents, or 1.89 per cent, at USD 45.28 and Brent added five cents, or 0.10 per cent, to USD 47.68. With US markets closed Monday for a holiday, electronic transactions on WTI will be booked today for settlement purposes.
The comments come three weeks before Russia joins OPEC, of which Saudi Arabia is the kingpin, for talks in Algeria to discuss the supply crisis that has hammered prices for two years.
"The longevity of the rally being how long before reality bites with the OPEC meeting still three weeks away."
The previous attempt at reaching a deal in April were scuppered by OPEC member Iran's refusal to agree to any output freeze, and there are worries about the chances of an agreement being reached in Algiers.
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