Oil futures added to last week’s gains as the U.S. and China agreed to slash tariffs for 90 days, but settle off the day’s highs as talks on Iran’s nuclear program and the Russia-Ukraine war keep open the possibility of sanctions eventually being lifted.

Oil prices jumped by about 4% on Monday after the U.S. and China said they would ease some of their tariff measures, raising hopes of an end to the trade war between the world’s two largest consumers of crude oil.