OPEC+ decided in April to return 2.1 million barrels per day (bpd) of supply to the market from May to July, anticipating rising global demand despite the high number of coronavirus cases in India, the world's third-largest oil consumer.
London stocks, resuming trade after a long holiday weekend in the UK, were also higher, with shares in heavyweight oil and mining groups in demand on rising commodity prices.
The JTC was meeting on Monday to assess market fundamentals ahead of a ministerial gathering on Tuesday of the Organization of the Petroleum Exporting Countries (OPEC) and allies led by Russia, a group know as OPEC+.
In its most recent monthly oil market report, the Organization of the Petroleum Exporting Countries (OPEC) raised its forecast for global oil demand growth by 70,000 barrels per day (bpd) to 5.95 million bpd.
The JTC meeting also expressed concern about rising COVID-19 cases in India, Japan and Brazil, the sources added.
"These disadvantages might include: weakening the immunity principle at a global level, putting at risk US interests overseas, and the protection for their personnel and assets," the letter said.
Barkindo said "several prominent US economic actors" had expressed reservations about the NOPEC bill, including the US Chamber of Commerce.
The short but intense falling out between two heavyweights in the 13-member cartel of oil-producing nations and its 10 affiliates threatened world crude storage capacity levels with cheap oil.