Huge crowds have turned out on the streets of Iran in state-organised rallies to mark the 40th anniversary of the country's Islamic Revolution.
On Feb. 11 that year, Iran's military stood down after days of street battles, allowing the revolutionaries to sweep across the country while the government of US -backed Shah Mohammad Reza Pahlavi resigned and the Islamic Republic was born.
Some demonstrators shouted "Death to Israel, Death to America" - sayings often repeated at the time of the revolution.
In a speech at Tehran's Azadi (Freedom) square, Rouhani said USA efforts to separate Iran from other countries would fail.
"We do not and we will not ask permission for producing any type of missiles from anybody", Rouhani said in his speech Monday, though he stressed that Iran would "continue constructive engagement" with the global community.
The two countries have not had diplomatic relations since 1980, and Trump has pulled the United States from an global agreement meant to reward Iran for giving up nuclear weapon ambitions.
Israel and Iran have not maintained diplomatic relations since the Islamic Revolution of 1979.
On Monday, Iranian state television broadcast images of people carrying Iranian flags and standing out in cold, rainy weather. "It has been moving forward over the past 40 years and making Iran stronger".
An Iranian man marches with a portrait of the country's Supreme Leader Ali Khamenei (L) alongside a woman holding up another of Islamic Revolution founder Ayatollah Ruhollah Khomeini (R) during a ceremony celebrating the 40th anniversary of Islamic Revolution in the capital Tehran on February 11, 2019.
"I don't ignore the threats from the Iranian regime, but I'm also not intimidated by them", Netanyahu said in a Hebrew-language video uploaded to social media.
Iranians take to streets for Islamic Revolution's 40th anniversary
Prices of basic foodstuffs have soared since President Donald Trump withdrew Washington from the 2015 nuclear deal in May 2019. This year's anniversary come as tensions are rising with the USA and Iran is grappling with re-imposed US sanctions.
"The presence of people today on the streets all over Islamic Iran means that the enemy will never reach its evil objectives", Rouhani himself told the crowds, vowing the "US conspiracy" against Iran will never succeed.
The large turnout in state-sponsored rallies came as Iranians face mounting economic hardships.
"We will not let America become victorious - Iranian people have and will have some economic difficulties, but we will overcome the problems by helping each other", he said in a speech.
In the tweets Trump said: '40 years of corruption.
Washington and its Arab allies have viewed Iran with great suspicion since the Islamic Revolution, fearing Khomeini's radical ideology would inspire militants across the Middle East.
He compared the US sanctions and economic hardships to "riding a bicycle when someone puts a stick in the wheels" but pointed to advances in other fields as more than making up for them.
"At the revolution's 40 anniversary we are on top of scientific achievements like nanotechnology or accurate missiles", he said.
Extensive fireworks displays were held across Tehran on Sunday night.
"Today the whole world should know that the Islamic Republic of Iran is considerably more powerful than the days of the war", Rouhani said.