Iran has showcased parts of S-300 air-defense missile systems ordered from Russia during its annual National Army Day parade in Tehran.
S-300 missile tubes and the radar equipment were shown during the April 17 military parade, according to pictures by the semiofficial ISNA news agency.
Addressing the event, President Hassan Rohani insisted that Iran's military power was purely for defensive and deterrent purposes.
Iran announced on April 11 that Russia had delivered the first part of its shipment of S-300 missile systems to Tehran.
In 2010, Russia froze a deal to deliver S-300s, among the world's most capable air-defense systems, to Iran under pressure from the West.
President Vladimir Putin lifted the suspension in April 2015.
The United States and Israel have expressed concern over the missile systems, fearing they could upset the regional balance of military power.