"We are ready to counter any threats against the [territorial] integrity of the Islamic Republic of Iran", he said.
"He was identified by the Defense Forces and prosecuted by the Tehran military prosecutor".
"Today, the situation in the region is to Iran's advantage".
Tensions between Washington and Tehran flared up after Iran, on Tuesday, said it shot down a USA "spy" drone which violated its airspace - a claim the U.S. denies - near the strategic Strait of Hormuz.
Deputy Majlis Speaker Masoud Pezeshkian says the downing of a highly advanced USA drone was a punch in the mouth of the "criminal America".
Tehran warned Washington Saturday that any attack would see its interests across the Middle East go up in flames after US President Donald Trump said he called off a strike at the 11th hour.
Iran has denied responsibility for those attacks.
"At this time of increased regional tensions and at a crucial period for the future of the nuclear deal, this visit is an opportunity for further open, frank and constructive engagement with the government of Iran", the UK Foreign Office said in a statement.
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According to a US official who spoke to the AP, the military strikes halted by Trump were recommended by the Pentagon and were among the options presented to senior administration officials.
"Threat for threat means that if the enemy fires a single bullet at us, it will receive 10 bullets and have to pay a heavy cost", he added, warning that any act of aggression against Iran will draw such a "historic response" that would make the assailants regret their move.
Jalal Hajizavar had left his post nine years ago and was convicted by a military court after an investigation which discovered documents and spying equipment at his home, the report said.
Iranian defence employee, Jalal Haji Zwar, who allegedly collaborated with the Central Intelligence Agency and spied for the United States, has been executed in Rajaishahr Prison, Iran, the Judiciary Organization of the Armed Forces of the Islamic Republic said in its statement.
Tehran repeated today that the drone was shot down over its territory.
But critics say his policy of "maximum pressure" - including abandonment of an global deal to regulate Iran's nuclear activities, economic sanctions and deployment of extra troops to the region - make war ever more likely.
CrowdStrike and FireEye, which regularly track such activity, say in recent weeks hackers believed to be working for the Iranian government have targeted USA government agencies, as well as sectors of the economy, including oil and gas.