Speaking from a podium in central Tehran, Iranian President Hassan Rouhani addressed the crowds for almost 45 minutes, lashing out at Iran's enemies - America and Israel - and claiming their efforts to "bring down" Iranians through sanctions will not succeed. "The Iranian people have and will have some economic difficulties but we will overcome the problems by helping each other", he said.
Israeli Prime Minister Benjamin Netanyahu has confirmed the Israeli army hit targets in Syria in an attempt to discourage Iran from gaining a foothold there.
State TV showed a cartoon of the Shah being thrown into the "dustbin of history", wearing clothes in USA colours and holding Iranian newspapers headlined "The Shah has left!"
The hardliners, who believe in the strict implementation of laws from 40 years ago, continuously clash with the reformists, who are pushing for more economic transparency. Iran insists that it has the right to operate in Syria, since it has been invited by Assad to help rebuild the country.
Waving Iranian flags, chanting "Death to America" and burning USA and Israeli flags, hundreds of thousands of people poured out onto the streets across Iran on Monday, marking the date that's considered victory day in the country's 1979 Islamic Revolution.
Today, Iran enjoys influence through proxies in Iraq, Syria, Lebanon and Yemen, raising concerns in Sunni Saudi Arabia, which accuses its rival of trying to dominate the Middle East. Tehran denies the allegations. Tyrannizing its own people and terrorizing the world.
In January, President Hassan Rouhani said his country was experiencing its worst economic crisis since the overthrow of the Shah.
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In the backdrop to Monday's marches, the military displayed Iranian-made missiles, which authorities showcase every year during anniversary celebrations.
Iranians burn flags of the United States during commemorations of the 40th anniversary of Islamic Revolution in the capital Tehran on February 11, 2019.
"The enemy can not ask us to leave the region".
In the beginning of 2017, Israel launched a military campaign to prevent Iran from consolidating itself in Syria, leading to hundreds of airstrikes on facilities belonging to the Islamic Republic across the war torn country.
Gen. Qassem Soleimani, the head of Iran's elite Quds Force, attended a rally in the southern city of Kerman. "They must leave the region", said Brig.
"We have not asked and will not ask for permission to develop different types of. missiles and will continue our path and our military power", President Hassan Rouhani said in a speech at Tehran's Azadi (Freedom) square.