Oil prices recouped some of last week's losses on Monday as a potential snag emerged in reviving the 2015 Iran nuclear deal that could add more oil supply, with indirect talks between Washington and Tehran due to resume this week.

Brent crude oil futures for July rose 38 cents, or 0.6%, to $66.82 a barrel by 0501 GMT, while U.S. West Texas Intermediate for July was at $63.96 a barrel, up 38 cents, or 0.6%, as reported by Reuters.

Read alsoParliament speaker elaborates on Ukraine's plans in case of Nord Stream 2 completionOil prices fell last week after Iran's president, Hassan Rouhani, said the United States was ready to lift sanctions on his country's oil, banking and shipping sectors.

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However, the speaker of Iran's parliament said on Sunday a three-month monitoring deal between Tehran and the U.N. nuclear watchdog had expired and that its access to images from inside some Iranian nuclear sites would cease.

European diplomats said last week that failure to agree an extension of the monitoring deal would plunge wider, indirect talks between Washington and Tehran on reviving the 2015 Iran nuclear deal into crisis. Those talks are due to resume in Vienna this week.

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