On Monday, oil prices remained mostly stable as investors looked at how Ukrainian drone attacks on Russian refineries might affect crude and fuel exports. They were also considering the growth in fuel demand in the U.S. Brent crude futures increased by 3 cents to $67.02 a barrel at 0009, while U.S. West Texas Intermediate crude rose by 8 cents to $62.77 a barrel.

Last week, both contracts rose by over 1% as Ukraine intensified its attacks on Russian oil facilities, targeting the major oil export terminal Primorsk and the Kirishinefteorgsintez refinery, which is among the largest in Russia. “The attack indicates an increasing readiness to interfere with global oil markets, which could lead to higher oil prices,” said JPMorgan. Primorsk can load around 1 million barrels per day of crude oil, which makes it an important export center for Russian oil and the biggest port in western Russia. The Kirishi refinery, run by Surgutneftegaz, handles around 17.7 million metric tons of Russian crude each year, which is about 355,000 barrels per day. This accounts for 6.4% of the total crude processed in the country.

A Russian oil company in Bashkortostan will keep its production levels steady, even after a drone attack on Saturday, according to regional governor Radiy Khabirov. Pressure is increasing on Russia as U.S. President Donald Trump stated on Sunday that he is ready to impose sanctions on Russia, but Europe needs to respond in a way that matches the United States. “Europe is purchasing oil from Russia. I don’t want them to buy oil,” Trump said. “The sanctions they are implementing are not strong enough. I am open to imposing sanctions, but they need to strengthen their measures to match what I am doing.” Investors are keeping an eye on the U.S.-China trade talks in Madrid that began on Sunday.

This comes as Washington is asking its allies to impose tariffs on imports from China due to its purchases of Russian oil. Last week, weaker job creation numbers and increasing inflation in the U.S. sparked worries about economic growth in the largest economy and oil consumer, even as the Federal Reserve is expected to lower interest rates during its meeting on September 16-17.