Iran’s President Ebrahim Raisi insisted Wednesday that his country is serious about reviving a deal meant to prevent it from acquiring a nuclear bomb but questioned whether Tehran could trust America’s commitment to any eventual accord.

The U.S. had already “trampled” on a previous deal, President  Raisi told the U.N. General Assembly, referring to America’s decision to pull out of the accord in 2018.

Ever since Iran’s 1979 revolution that overthrew its Western-backed shah, Tehran has been at odds with the United States and has sought to project itself as a counterweight to American power.

Tehran’s resolve to resist U.S. pressure has seen it build close ties with countries like Russia, develop a domestic ballistic missile program and attempt to export its narrow revolutionary ideals to countries across the Mideast through Shiite militias and proxies.

Its nuclear program, which Iran insists is for peaceful energy purposes, is seen as an extension of its defiance of an American-led world order.

After former U.S. President Donald Trump walked away from the deal brokered by the Obama administration, Tehran steadily abandoned every limitation the accord imposed on its nuclear enrichment.

But efforts to salvage the deal are now nearing a take-it-or-leave-it inflection point. European Union officials have warned the window for securing a nuclear deal is about to close.

In exchange for agreeing to the terms of the new nuclear deal, Iran would receive relief on economic sanctions and be given greater access to global financial markets and the flow of U.S. dollars.

U.S. Secretary of State Antony Blinken called on every U.N. Security Council member to “send a clear message” to Russia that it must stop its nuclear threats in the war in Ukraine.

Blinken used a council session Thursday to criticize Russia’s invasion and press other countries to join in their forceful condemnations of the conflict.

Russian President Vladimir Putin said earlier this week that his nuclear-armed country “certainly use all means available to us” if its territory is threatened and to defend the country and its people.

Blinken said, “Every council member should send a clear message that these reckless nuclear threats must stop immediately,” A day after President Joe Biden assailed Russian leader Vladimir Putin for what he called egregious violations of the U.N. Charter and international law, the U.S. made the case at the U.N. Security Council that Russia should face further censure and isolation for its invasion.

Blinken listed several allegations of war crimes and other atrocities and called on countries that have yet to speak out forcefully against them as an affront to international order.

As the meeting began, there were already signs of a charged atmosphere around the council’s famous horseshoe-shaped table.