On May 28, Brent crude edged above $107 per barrel as poll demonstrating support for a pro-bailout government in Greece calmed fears of a euro zone exit hitting demand admit the lack of progress in talks over Iran's nuclear program spurred supply worries.

Brent crude was further helped by a weakening dollar that marked a third straight session of gains although the crude benchmark is still off more than 16 percent from the high of this year above $128 reached in March given a wobbly outlook for the global economy.

After a May 6 vote left parliament divided evenly between groups of parties that support and oppose the austerity conditions, Greece was forced to call repeat elections for June 17.

Front-month Brent rose 64 cents to $107.47 a barrel by 0412 GMT, while U.S. crude was up 89 cents at $91.75.

"Today it really comes down to what is going on in Greece, the idea that Greece will stay within the euro zone calms the market," said Ben Taylor, a trader at CMC markets.

"A move towards creating a common euro bond, and stimulating the economy through growth-related policies versus austerity are factors that will be positive for markets."

The euro bounced off two-year lows in Asian trade on Monday, hitting $1.2594.