Brent crude fell 25 cents, or 0.4%, to $70.11 a barrel by 0037 GMT. U.S. West Texas Intermediate crude was at $66.76 a barrel, down 28 cents. WTI declined for a seventh successive week, the longest losing streak since November 2023. Brent was down for a third consecutive week after US President Donald Trump imposed then delayed tariffs on its key oil suppliers Canada and Mexico while raising taxes on Chinese goods. Trump said he wanted to negotiate a deal with OPEC member Iran to prevent the latter seeking nuclear weapons – though Iran has said it is not seeking such weapons. Meanwhile, the Organization of the Petroleum Exporting Countries and allies including Russia, collectively known as OPEC+, said it will proceed with oil output hikes from April. The US is also studying ways to ease sanctions on Russia’s energy sector if Russia agrees to end its war with Ukraine, two people familiar with the matter told Reuters. The U.N. Security Council is set to meet this week to discuss the state of the global economy.