Protest over the death of Mahsa Amini, in Tehran
A police motorcycle burns during a protest over the death of Mahsa Amini, a woman who died after being arrested by the Islamic republic's "morality police", in Tehran, Iran September 19, 2022. WANA (West Asia News Agency) via Reuters

Nationwide protests sparked by the death in custody of Iranian Kurdish woman Mahsa Amini have ushered Iran into a new era of deepening crisis between the clerical leadership and society at large.

Amini's family said she was beaten after being arrested by the morality police on Sept. 13 for violating the Islamic Republic's imposed dress code. Amini died three days later. Authorities have blamed the 22-year-old's death on preexisting medical problems.

Her death unleashed years of pent up grievances in Iranian society, over issues ranging from tightening social and political controls to economic misery and discrimination against ethnic minorities.

Facing their worst legitimacy crisis since the 1979 Islamic Revolution, Iran's religious leaders have tried to portray the unrest as breakaway uprisings by ethnic minorities threatening national unity rather than its clerical rule.

Those efforts by authorities have been undermined by solidarity between Iran's different ethnic groups during the protests, according to activists and rights groups, with protesters chanting slogans in support of minorities.

Protesters from all walks of life have taken to the streets, calling for the downfall of the Islamic Republic. Women have torn off and burned the compulsory headscarves in fury.

Iran's rulers have accused a coalition of "anarchists, terrorists and foreign foes" of orchestrating the protests in which the activist HRANA news agency said 506 protesters had been killed as of Dec. 21, including 69 minors.

HRANA said 66 members of the security forces had also been killed. Two protesters have been executed, drawing strong Western condemnation, and thousands have been arrested.

WHY IT MATTERS

The turmoil, with women and youth in the forefront, poses a grave threat to the priority that has defined Supreme Leader Ayatollah Ali Khamenei's rule since 1989 - the survival of the Islamic Republic and its religious establishment, at any cost.

However, the persistent unrest does not mean the four-decade-old Islamic Republic will disappear any time soon given the power wielded by its security apparatus. The protest movement is leaderless, a challenge to forcing a new political order.

But the unrest has shown the establishment's vulnerability to popular anger, raising concerns among top leaders that a misstep could mean more trouble ahead, even if current protests subside.

There is no guarantee greater force will end the unrest, as so far the violent crackdown has only stoked more protests.

The clampdown on the protests and Iran's suspected transfer of drones and missiles to Russia to help Moscow in its war in Ukraine have made Western leaders reluctant to push for the revival of a 2015 nuclear pact that would provide Tehran billions of dollars worth of extra resources.

Alarmed by popular discontent, the clerical leaders fear economic misery could alienate core supporters among middle and lower-income Iranians should the nuclear deal remain on ice.

WHAT DOES IT MEAN FOR 2023?

The Islamic Republic will be engulfed by what analysts call a "revolutionary process" that will likely fuel more protests into 2023, with neither side backing down.

With Khamenei, 83, believing compromise on the republic's ideological pillars such as hijab would bring its collapse, the establishment will double down on repression, resulting in more anger among the 85 million population, 70% of whom are under 30.

The question of who will eventually succeed him as supreme leader, a role with vast power, may intensify jockeying among the elite, potentially widening rifts in the establishment.

Four years of sanctions have not stopped Iran's expansion of its nuclear programme or curtailed its support for proxies abroad. But its domestic crisis will likely give Western powers more scope to increase pressure on Tehran.

Explore the Reuters round-up of news stories that dominated the year, and the outlook for 2023.

(Writing by Parisa Hafezi, Editing by Tom Perry, William Maclean, Peter Graff)

Protest against the Islamic regime of Iran following the death of Mahsa Amini, in Istanbul
People take part in a protest against the Islamic regime of Iran following the death of Mahsa Amini, in Istanbul, Turkey December 10, 2022. Reuters
Members of the Iranian community living in Turkey attend a protest in support of Iranian women in Istanbul
A woman attends a protest of members of the Iranian community living in Turkey in support of Iranian women, after the death of Mahsa Amini, in Istanbul, Turkey December 13, 2022. Reuters
Iran's Supreme Leader Ayatollah Ali Khamenei speaks during a meeting with a group of students in Tehran
Iran's Supreme Leader Ayatollah Ali Khamenei speaks during a meeting with a group of students in Tehran, Iran November 2, 2022. Office of the Iranian Supreme Leader/WANA (West Asia News Agency)/Handout via REUTERS Reuters
Shops are closed following the recent riots and the call of protesters to close the markets, in Tehran
Shops are closed following the recent riots and the call of protesters to close the markets, in Tehran Bazaar, in Tehran, Iran November 16, 2022. WANA (West Asia News Agency) via REUTERS Reuters