He pointed out that it was the first time that Iranian missile power showed itself to the world on the ground, and stressed that the enemies of the Islamic Republic should know that "in the event of an invasion or violation of global law, they will be confronted with an overwhelming response".
General Ramazan Sharif of Iran's elite Revolutionary Guards (IRGC) warned ISIS from carrying out future attacks because "if they carry out a specific action to violate our security, definitely there will be more launches, with intensified strength".
Sunday's missile strike came amid recent confrontations in Syria between US -backed forces and pro-government factions.
Russian Federation has been a key ally of Bashar Assad, Syria's president, since 2015. At the time, the Kremlin said Putin called the USA strike an "aggression against a sovereign state in violation of worldwide law". The missiles flew over 500 miles over Iraqi territory, and are the first mid-range projectiles launched by Iran since its war with Iraq, which ended in 1988.
The tweet appeared to refer to comments made by Saudi Arabia's deputy crown prince, Mohammed bin Salman al-Saud, in May, who said Riyadh would bring "the battle" for regional influence inside Iran. On Monday, Russia warned the United States that it will treat the US-led coalition planes in Syria, west of the Euphrates, as targets.
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It also raises questions about how U.S. President Donald Trump's administration, which had previously put Iran "on notice" for its ballistic missile tests, will respond. "We will slap them", Khamenei says in the video, before it fades into a footage of the missile launch on Sunday night. It has test-fired a number of missiles since Iran struck the 2015 nuclear deal with world powers, including the U.S.
US -backed opposition fighters said Assad's forces have been attacking them in the northern province of Raqqa and warned that if such attacks continue, the fighters will take action.
Iranian officials meanwhile offered a series of threats of more strikes, including former Guard chief Gen. Mohsen Rezai. Iran has sent to Syria military advisers as well as thousands of "volunteer" fighters recruited among its own nationals as well as the Shiite communities in neighbouring Afghanistan and Pakistan since Syria's conflict broke out in March 2011.
Sunday's attack was the first time the Zolfaqar has been used in combat.