Oil prices rallied for a third day on Tuesday as major producers Saudi Arabia and the United Arab Emirates looked unlikely to be able to boost output significantly and political unrest in Libya and Ecuador added to supply concerns.
US West Texas Intermediate (WTI) crude futures rose $1.65, or 1.5 per cent, to $111.22 a barrel by 0927 GMT, extending a 1.8 per cent gain in the previous session.
Brent crude futures climbed $1.83, or 1.5 per cent, to $116.92, adding to the previous session's 1.7 per cent rise. 
Saudi Arabia and the UAE have been seen as the only two countries in the Organization of the Petroleum Exporting Countries (Opec) with spare capacity to make up for lost Russian supply and weak output from other member nations.
"A seam of tight supply news bolstered the market. Two major producers, Saudi Arabia and 
the UAE, are said to be at, or very close to, near term capacity limits," Commonwealth Bank commodities analyst Tobin Gorey said in a note.
French President Emmanuel Macron told US President Joe Biden on the sidelines of the Group of Seven nations meeting that the UAE was producing at maximum capacity and Saudi Arabia could increase output by only 150,000 bpd, well below its nameplate spare capacity of around 2 million bpd.
UAE Energy Minister Suhail al-Mazrouei said on Monday the UAE was producing near maximum capacity based on its quota of 3.168 million barrels per day (bpd) under the agreement with Opec and its allies, together called Opec+.
Analysts also said political unrest in Ecuador and Libya could tighten supply further.
Libya's National Oil Corp said on Monday it might have to declare force majeure in the Gulf of Sirte area within the next three days unless production and shipping resume at oil terminals there.
Ecuador's Energy Ministry said the country could suspend oil output completely within the next two days following anti-government protests. The former Opec country was pumping around 520,000 barrels per day before the protests.
Those factors underscore shortages in the market, which have led to a rebound this week, countering recession jitters that weighed on prices over the previous two weeks.
Leaders of the G7 are discussing a potential price cap on Russian oil and gas that would hit President Vladimir Putin's war chest while also lowering energy prices.
A French presidential official also called on global powers to explore all options to alleviate a Russian squeeze on energy supplies that has boosted prices, including talks with producing nations such as Iran and Venezuela. --Reuters