"Oil markets are rallying because OPEC is sceptical that the increase in U.S. oil production is going to be enough to change their plans to support prices," said Phil Flynn, senior analyst at Price Futures Group in Chicago.
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+.