President Hassan Rohani said Iran would make or buy any weapons it needed to defend itself in a region beset by "invading powers," as the military paraded missiles and soldiers in front of him on National Army Day.
Fighter jets and bombers flew overhead as Rohani told the Tehran crowd and a live TV audience on Wednesday that Iran's forces posed no threat to its neighbors.
"We tell the world that we will produce or acquire any weapons we need, and will not wait for their approval ... We tell our neighbouring countries that our weapons are not against you, it's for deterrence," Rohani said.
"We are not living in a normal region, and we see invading powers have built bases around us. Disregarding the principles of international law, they intervene in regional affairs and invade other countries without UN permission," Rohani added.
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U.S., British and French forces pounded Iran's ally Syria with airstrikes early on Saturday in retaliation for a suspected April 7 chemical weapons attack, which they blame on Syrian President Bashar Assad's government.
Britain, France and Germany have proposed fresh EU sanctions on Iran over its ballistic missiles and its role in Syria's war, in a bid to persuade U.S. President Donald Trump to preserve the 2015 nuclear deal with Tehran.
Trump has delivered an ultimatum to the European signatories to fix what he saw as the "terrible flaws" of the deal, threatening to refuse to extend U.S. sanctions relief on Iran.
U.S. sanctions will resume unless Trump issues fresh "waivers" to suspend them on May 12.