The United States (US) aims to cut Iran's crude exports by about 20 per cent to below 1.0 million barrels per day (bpd) from May by requiring importing countries to reduce purchases to avoid US sanctions, two sources familiar with the matter told Reuters.
US President Donald Trump eventually aims to halt Iranian oil exports and thereby choke off Tehran's main source of revenue. Washington is pressuring Iran to curtail its nuclear programme and stop backing militant proxies across the Middle East.
The United States will likely renew waivers to sanctions for most countries buying Iranian crude, including the biggest buyers China and India, in exchange for pledges to cut combined imports to below 1.0 million bpd. That would be around 250,000 bpd below Iran's current exports of 1.25 million bpd.
"The goal right now is to reduce Iranian oil exports to under 1.0 million barrels per day," one of the sources said, adding the Trump administration was concerned that pressing for a complete shutdown of Iran's oil in the short-term would trigger a global oil price spike.
Washington may also deny waivers to some countries that have not bought Iranian crude recently, the sources said.
The US reimposed sanctions in November after pulling out of a 2015 nuclear accord between Iran and six world powers. Those sanctions have already halved Iranian oil exports.
To give time to importers to find alternatives and prevent a jump in oil prices, the US granted Iran's main oil buyers waivers to sanctions on the condition they buy less in the future. The waivers are due for renewal every six months.
"Zeroing out could prove difficult" one of the sources said, adding a price of around $65 a barrel for international benchmark Brent crude was "the high end of Trump's crude price comfort zone."
Brent crude settled at $67.55 a barrel on Wednesday.
Both sources said they were briefed by the Trump administration on the matter but were not authorized to speak publicly about it and asked for anonymity.
While the latest talks on waivers aimed for a reduction in exports, the sources said the administration remained committed to a complete halt in the future.
Brian Hook, the State Department's special representative on Iran, also said in remarks at an industry conference in Houston on Wednesday that Washington is pursuing its plan to bring Iranian crude exports to zero.
Another report from London adds: Brent and West Texas Intermediate crude oil futures reached four-months highs on Thursday, as a production curb agreement by OPEC and its partners along with US sanctions on Iran and Venezuela tightened global supplies.
An unexpected dip in US crude oil inventories and production also supported prices, traders said.
Brent crude oil futures hit a 2019-peak of $68.14 per barrel on Thursday before easing modestly to $67.05 by 0840 GMT, up 50 cents or 0.74 per cent from Wednesday's close.