A worker at an oil processing facility of Saudi Aramco, a Saudi Arabian state-owned oil and gas company, at the Abqaiq oil field.

Oil prices fell to the lowest in more than 17 years as demand plunged as a result of the pandemic and an unrelenting price war between Saudi Arabia and Russia showed no signs of easing.

Brent crude prices hit $23.03 a barrel on Monday morning during Asia hours – the lowest level since Nov. 15, 2002. It has since clawed back some losses following that record decline, but was last still 5.86% lower at $23.47 a barrel.

U.S. West Texas Intermediate (WTI) crude futures briefly dipped below $20 per barrel to $19.90 – their lowest level since March 20, when they fell as low as $19.50. WTI was last 4.51% lower at $20.54 per barrel.

Those declines come as Saudi Arabia signaled no breakthrough in the oil price war with Russia. On Friday, the two countries were still at a stalemate, with Saudi Arabia saying it was not in talks with Russia to stabilize oil markets despite Washington stepping in to pressure both sides to end the price war.

"Russia and Saudi Arabia show no signs of compromising in their standoff over oil supply," National Australia Bank's Rodrigo Catril wrote in a Monday note.