International Brent crude oil futures were at $67.26 a barrel at 0005 GMT, up 14 cents, or 0.2 percent, from their last close. They ended Friday little changed after touching their highest since Nov. 16 at $67.73 a barrel.
U.S. West Texas Intermediate (WTI) crude futures were at $57.38 per barrel, up 11 cents, or 0.2 percent, from their last settlement. WTI futures climbed 0.5 percent on Friday, having marked their highest since Nov. 16 at $57.81 a barrel.
"Crude prices continue to be supported on optimism a trade deal will be reached in the coming days by the world's two largest economies, said Edward Moya, senior market analyst, OANDA.
President Donald Trump said on Sunday he would delay an increase in U.S. tariffs on Chinese goods scheduled for later this week thanks to progress in trade talks and said if progress continued, he and Chinese President Xi Jinping would seal a deal.
Signs of reduced global oil supply also supported crude prices.
U.S. energy firms this week cut the number of oil rigs operating for the first time in three weeks week after U.S. crude production hit an all-time high, boosting exports to a record-peak and stockpiles to their highest in over a year.
Meanwhile, Mexico's Pemex produced 1.62 million barrels of crude per day in January, less than any month in almost three decades, the state-owned oil company said on Friday, underscoring the challenges facing a government that vows to pump far more in a few years. - Reuters