S-300 missiles
S-300 missilesReuters

Iran's elite Revolutionary Guard on Sunday displayed the country's sophisticated Russian-made S-300 air defense system in central Tehran, The Associated Press.

This is the first time that the S-300 air defense system has been displayed in public.

The public show in Tehran's Baharestan square near the Parliament building square exhibited different missile systems, including ballistic missiles, solid-fuel surface-to-surface Sejjil missiles and the liquid-fuel Ghadr, according to AP.

Russian President Vladimir Putin signed a decree in 2015 lifting a ban on the delivery of the S-300 to Iran, explaining that his decision was motivated by Iran's drive to find a solution in talks over its nuclear program.

Despite the lifting of the ban, the sale had been repeatedly delayed due to Western pressure given that UN nuclear sanctions ban the delivery to Iran. Russia finally delivered the missiles last year.

Earlier this year, Iran said that the advanced air defense system was operational.