Global oil prices tumbled on Monday after United States President Donald Trump said Washington was holding “good talks” with Iran, raising hopes of a diplomatic breakthrough following the suspension of a two-week bombing campaign against the Islamic Republic.

Brent crude, the international oil benchmark, fell by about 8.2 per cent to below $90 per barrel after dropping as low as $87.55 during trading. The decline came after prices briefly climbed above $100 per barrel last week amid heightened tensions in the Middle East.

Reuters quoted Trump as saying there was a good chance of reaching an agreement with Tehran but warned that the United States would resume military action if negotiations failed.

“We’re talking right now. We’re having good talks. I think there’s a good chance that something could happen, and if it does, good; if it doesn’t, we go back to doing what we were doing two days ago,” Trump said.

The latest comments followed Washington’s decision on Saturday to suspend its air strikes on Iran after 13 consecutive nights of bombing.