Oil prices tumbled to their lowest levels in almost three weeks on Tuesday as supply disruption fears eased and as surging COVID-19 cases in China spurred demand concerns.
Brent futures were down $6.40, or 5.9%, to $100.50 a barrel at 1308 GMT, while US West Texas Intermediate (WTI) crude was down $6.35, or 6.1%, to $96.66 a barrel.
Brent fell as low as $97.44 and WTI hit $93.54, their lowest levels since Feb 25.
The steep decline followed a statement from Russian Foreign Minister Sergei Lavrov that Moscow is in favour of the 2015 Iran nuclear deal resuming as soon as possible.
The talks to revive the nuclear accord, which would lead to sanctions on Iran's oil sector being lifted and allow Tehran to resume crude exports, had recently stalled due to Russian demands.
Prices extended their losses from the previous day's 5% decline after a steep jump in daily COVID-19 infections in China.
On Tuesday talks between Ukrainian and Russian negotiators were expected to continue on Tuesday.