Brent crude futures slid 13 cents, or 0.2%, to $84.90 a barrel by 0640 GMT after settling down 37 cents on Friday. US West Texas Intermediate crude stood at $82.15 a barrel, down 6 cents, or 0.1%.
The dollar, which firmed after a failed assassination bid on US presidential candidate Donald Trump, weighed on oil prices. [MKTS/GLOB]
A stronger dollar tends to lower oil prices as buyers using other currencies have to pay more for their dollar-denominated crude.
"I don't think you can ignore the uncertainty that the weekend's assassination attempt will cast across a deeply divided country in the lead-up to the election," said IG market analyst Tony Sycamore.
In the Middle East, talks on ending the Gaza conflict between Israel and Hamas halted on Saturday, 13 July 2024 after three days, though a Hamas official said the following day it had not withdrawn from discussions.
However, an Israeli attack targeting the group's military leader killed 90 people on Saturday.
The uncertainty around the volatile situation has kept the geopolitical premium in oil elevated.
Oil markets are also broadly underpinned by supply cuts from OPEC+ with Iraq's oil ministry saying it will compensate for any overproduction since the beginning of 2024.
Last week, Brent fell more than 1.7% after four weeks of gains while WTI futures slid 1.1% as a fall in China's crude imports, the world's top importer, countered robust summer consumption in the United States.
"While fundamentals are still supportive, there are growing demand concerns, largely emanating from China," ING analysts led by Warren Patterson said in a note.
China's crude oil imports fell 2.3% in the first half of this year to 11.05 million barrels a day, amid disappointing fuel demand and as independent refiners cut output due to weak profit margins.
Crude throughput at Chinese refineries fell 3.7% in June from a year earlier to 14.19 million bpd, the year's lowest so far, customs data showed on Monday.
China's economy slowed in the second quarter as a protracted property downturn and job insecurity weighed on domestic demand, keeping alive expectations Beijing will need to unleash more stimulus.
In the United States, active oil rig count, an early indicator of future output, fell by one to 478 last week, the lowest since December 2021, energy services firm Baker Hughes said on Friday.
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