Iran has held a second day of war games aimed at ensuring it's nuclear facilities are well protected. An Iranian air force commander had a warning for Israel earlier on Monday that his country can halt any potential air strikes.
The five-day drill covers about a third of Iran. It's spread across the central, western and southern parts of the country.
Iran's elite Revolutionary Guard, the paramilitary Basij forces affiliated with the Guard, and army units are involved.
General amir Ali Hajizadeh, air Force Commander, said, "This has been designed based on a preemptive strike and our fighter troops will engage with the enemy as if it was a real situation."
The war games cover regions where Iran's nuclear facilities are located.
On Sunday, Iran's defense ministry said it planned to pursue design and production of its own air defense missiles. His comments were in response to the delay in the delivery from Russia of S-300 anti-aircraft missiles, meant to be a key component of Iran's air defense. Iran complains the delay is apparently the result of Israeli and US pressure.