Tehran has finalized a deal to purchase Su-35 fighter jets from Moscow, Iranian state media reported, as defense cooperation between the two countries deepens.

In a statement to the United Nations, Tehran said it began approaching "countries to buy fighter jets" to replenish its fleet in the wake of the 1980-88 Iran-Iraq war.

"Russia announced it was ready to sell them" after the expiry in October 2020 of restrictions on Iran purchasing conventional weapons under UN Resolution 2231, said the statement carried out late Friday by the official IRNA news agency.

"The Sukhoi 35 fighter jets were technically acceptable for Iran," it added.

It was reported in mid-March that Iran was expected to receive multiple Sukhoi Su-35 fighter jets from Russia as early as March.

At the time, MP Shahriar Heidari told Tasnim news agency that alongside the fighter jets, Iran will also receive military equipment such as air defense systems, missile systems, and helicopters that they had previously ordered. Media has reported that 24 of the fourth-generation twin-engine, super-maneuverable Sukhoi fighter jets meant for air superiority missions are part of the package. 

In September, Iranian Army Air Force Commander Hamid Vahedi announced that the IRIAF is looking to purchase Russian Sukhoi Su-35 fighter jets. Even Turkey was considering the Su-35 as an alternative for the US-made F-16s in case of a fallout with the United States. 

Iran and Russia have been undertaking measures and agreements to boost their economic, trade, energy, and military cooperation. In December, CIA Director William Burns pointed out that the US was concerned about the growing cooperation between Russia and Iran and fears that it could eventually evolve into a full defense partnership.

This is the first time in decades that Iran has acquired new fighter aircraft, with the exception of several MiG-29 Fulcrum's Tehran bought back in the 1990s.