Oil edged higher on Friday as Russia reiterated its commitment to joining a producers' output freeze to stem a two-year slide in prices, but a strong dollar capped the gains.
Global benchmark Brent crude futures were 44 cents higher at $51.82 a barrel at 1132 GMT.
U.S. West Texas Intermediate (WTI) crude was trading at $50.95 a barrel, up 32 cents from its last settlement.
Russian Energy Minister Alexander Novak said on Friday an oil production freeze agreement was necessary to prop up prices and that he would make proposals to his Saudi Arabian counterpart this weekend.
The Organization of the Petroleum Exporting Countries will hold a meeting on Nov. 30 to find common ground on capping output. This is expected to work out how each member country will contribute to a freeze.
"The near term fundamentals in the oil market have turned positive. Demand is stabilising, OPEC production has peaked (and will fall if cuts are implemented), and global inventory declines imply that the market is more balanced than many believe," Neil Beveridge of Bernstein Energy said in a note to clients.