Iran’s Supreme Leader Ali Khamenei has ruled out talks with the United States in significantly timed comments that were among his most pessimistic on prospects for relations with Washington, and even the west.

Ayatollah Khamenei, the high-ranking cleric who is Iran’s ultimate spiritual and political authority, denounced the policy of “maximum pressure” pursued by the administration of Donald Trump, and rejected the possibility of talks with American officials until the US returns to the 2015 nuclear deal it abandoned last year.

He also dismissed the possibility of a much-speculated upon meeting between Mr Trump and Iranian president Hassan Rouhani during the annual gathering of the United Nations General Assembly in New York this week.

“The maximum pressure policy is worthless in front of the Iranian nation, and every official in Iran collectively believes there will be no talks with America at any level,” he told seminary students, according to state media.

Until sanctions reimposed following the US withdrawal from the deal last year are lifted, he said “there will be no talks at any level between officials of the Islamic Republic and Americans, neither in New York nor elsewhere”.

The ruling out of talks follows an attack on crucial Saudi oil facilities on Saturday that took half of the country’s petroleum-producing potential temporarily offline.

Attack on major oil facilities in Saudi Arabia: In pictures Show all 10 1 /10 Attack on major oil facilities in Saudi Arabia: In pictures Attack on major oil facilities in Saudi Arabia: In pictures Smoke billows from multiple fires at the Aramco oil processing facility in Abqaiq, Saudi Arabia on 14 September Reuters Attack on major oil facilities in Saudi Arabia: In pictures Thick black smoke billows from a fire following drone strikes on major oil facilities in Abqaiq, Saudi Arabia Planet Labs Inc/Reuters Attack on major oil facilities in Saudi Arabia: In pictures The Aramco oil processing facility in Abqaiq, Saudi Arabia prior to the drone strikes on 14 September AP Attack on major oil facilities in Saudi Arabia: In pictures Damage is seen to the Aramco oil processing facility in Abqaiq, Saudi Arabia following drone strikes on 14 September, the previous day (Image 1 of 2) AP Attack on major oil facilities in Saudi Arabia: In pictures Damage is seen to the Aramco oil field in Abqaiq, Saudi Arabia following drone strikes on 14 September, the previous day (Image 2 of 2) AP Attack on major oil facilities in Saudi Arabia: In pictures Damage is seen to the Aramco oil field in Khurais, Saudi Arabia following drone strikes on 14 September, the previous day (Image 1 of 2) AP Attack on major oil facilities in Saudi Arabia: In pictures Damage is seen to the Aramco oil field in Khurais, Saudi Arabia following drone strikes on 14 September, the previous day (Image 2 of 2) AP Attack on major oil facilities in Saudi Arabia: In pictures Smoke billows from multiple fires following drone strikes on major oil facilities in Abqaiq, Saudi Arabia AFP/Getty Attack on major oil facilities in Saudi Arabia: In pictures Smoke rises from a fire following a drone strike at the Aramco facility in Abqaiq, Saudi Arabia on 14 September Reuters Attack on major oil facilities in Saudi Arabia: In pictures Smoke is seen following a fire at the Aramco oil processing facility in Abqaiq, Saudi Arabia on 14 September Reuters

Yemen’s Houthi rebels, currently fighting Saudi-led forces in a four-year war for control of their own country, claimed responsibility for the attack, but US officials insist it was Iran’s doing, without providing conclusive evidence.

Saudi Arabia has said its preliminary investigation suggests Iranian-made weapons were used in the attack, which left no injuries, but has been circumspect in assigning blame, calling for an international investigation overseen by the United Nations.

Iran has denied it was behind the attack, mocking the US accusations.

Both the Trump administration and Saudi Arabia’s leadership are contemplating a response, but worry that any military action could potentially lead to an attack on more oil infrastructure, further driving up world oil prices.

Armed conflict with an enemy as unpredictable and steeped in unconventional methods of warfare as Iran could damage both the Saudi economy and that of the US less than 14 months before highly anticipated presidential and legislative elections.

Facing sanctions that are crippling its economy, the Iranian leadership has repeatedly vowed it would respond in kind by hurting the economies of its adversaries.

The Trump administration is considering a deal proposed by French president Emmanuel Macron to grant Iran $15bn (£12bn) in credit to Iran to ease tensions and create breathing space for diplomacy.

But Ayatollah Khamenei appeared to downplay the possibility France could broker such a deal, distinguishing Iran from what he described as “the dependents of the rotten system of western capitalism”.