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Who is Hamas Leader Yahya Sinwar?

(FILES) Yahya Sinwar attends the opening of a new mosque in Rafah town in the southern Gaza Strip on February 24, 2017. (Photo by SAID KHATIB / AFP)
(FILES) Yahya Sinwar attends the opening of a new mosque in Rafah town in the southern Gaza Strip on February 24, 2017. (Photo by SAID KHATIB / AFP)
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Who is Hamas Leader Yahya Sinwar?

(FILES) Yahya Sinwar attends the opening of a new mosque in Rafah town in the southern Gaza Strip on February 24, 2017. (Photo by SAID KHATIB / AFP)
(FILES) Yahya Sinwar attends the opening of a new mosque in Rafah town in the southern Gaza Strip on February 24, 2017. (Photo by SAID KHATIB / AFP)

Hamas leader Yahya Sinwar, a mastermind of the Oct. 7, 2023 attack on Israel that triggered the war in Gaza, has been killed in a military operation.
His death would be a significant moment in Israel's yearlong offensive against the militant group and could complicate efforts to release dozens of hostages held in Gaza.
Sinwar became the head of Hamas after the killing of the previous leader, Ismail Haniyeh, in an explosion in Iran in July that was widely blamed on Israel.
Some things to know about Sinwar:
From refugee camp to Hamas militant Sinwar was born in 1962 in a refugee camp in the Gaza town of Khan Younis. He was an early member of Hamas, which was formed in 1987. He eventually led the group's security arm, which worked to purge it of informants for Israel.
Israel arrested him in the late 1980s and he admitted to killing 12 suspected collaborators, a role that earned him the nickname “The Butcher of Khan Younis.” He was sentenced to four life terms for offenses that included the killing of two Israeli soldiers, The Associated Press reported.
A prison leader Sinwar organized strikes in prison to improve working conditions. He also studied Hebrew and Israeli society.
He survived brain cancer in 2008 after being treated by Israeli doctors.
Sinwar was among more than 1,000 Palestinian prisoners released in 2011 by Prime Minister Benjamin Netanyahu as part of an exchange for an Israeli soldier captured by Hamas in a cross-border raid.
When Sinwar returned to Gaza, he quickly rose through Hamas' leadership ranks with a reputation for ruthlessness. He is widely believed to be behind the 2016 killing of another top Hamas commander, Mahmoud Ishtewi, in an internal power struggle.
Sinwar became head of Hamas in Gaza, effectively putting him in control of the territory, and worked with Haniyeh to align the group with Iran and its proxies around the region while also building the group's military capabilities.
There is widespread evidence that Sinwar, along with Mohammed Deif, the head of Hamas’ armed wing, engineered the surprise Oct. 7 attack on Israel.
The International Criminal Court’s prosecutor sought arrest warrants in May for Sinwar, Deif and Haniyeh for their alleged roles in the attack.
Israel said it killed Deif in a strike in July, while Hamas says he is still alive.
Where would this leave Hamas? Sinwar has been in hiding since the attack, and cease-fire negotiators have said it can take several days to send and receive messages from him.
Even before becoming Hamas' top leader, Sinwar was believed to have the final word on any deal to release hostages held by the militant group. Some 100 hostages remain in Gaza, around a third of whom are believed to be dead.
It's unclear who would replace Sinwar, and what that might mean for the cease-fire efforts, which sputtered to a halt in August after months of negotiations brokered by the United States, Egypt and Qatar.

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What to Know about Sudden Gains of the Opposition in Syria's 13-year War and Why it Matters

Fighters seize a Syrian Army tank near the international M5 highway in the area Zarbah which was taken over by anti-government factions on November 29, 2024, as Hayat Tahrir al-Sham (HTS) group and allied groups continue their offensive in Syria's northern Aleppo province against government forces. (Photo by Rami al SAYED / AFP)
Fighters seize a Syrian Army tank near the international M5 highway in the area Zarbah which was taken over by anti-government factions on November 29, 2024, as Hayat Tahrir al-Sham (HTS) group and allied groups continue their offensive in Syria's northern Aleppo province against government forces. (Photo by Rami al SAYED / AFP)
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What to Know about Sudden Gains of the Opposition in Syria's 13-year War and Why it Matters

Fighters seize a Syrian Army tank near the international M5 highway in the area Zarbah which was taken over by anti-government factions on November 29, 2024, as Hayat Tahrir al-Sham (HTS) group and allied groups continue their offensive in Syria's northern Aleppo province against government forces. (Photo by Rami al SAYED / AFP)
Fighters seize a Syrian Army tank near the international M5 highway in the area Zarbah which was taken over by anti-government factions on November 29, 2024, as Hayat Tahrir al-Sham (HTS) group and allied groups continue their offensive in Syria's northern Aleppo province against government forces. (Photo by Rami al SAYED / AFP)

The 13-year civil war in Syria has roared back into prominence with a surprise opposition offensive on Aleppo, one of Syria's largest cities and an ancient business hub. The push is among the opposition’s strongest in years in a war whose destabilizing effects have rippled far beyond the country's borders.
It was the first opposition attack on Aleppo since 2016, when a brutal air campaign by Russian warplanes helped Syrian President Bashar Assad retake the northwestern city. Intervention by Russia, Iran and Iranian-allied Hezbollah and other groups has allowed Assad to remain in power, within the 70% of Syria under his control.
The surge in fighting has raised the prospect of another violent front reopening in the Middle East, at a time when US-backed Israel is fighting Hamas in Gaza and Hezbollah in Lebanon, both Iranian-allied groups.
Robert Ford, the last-serving US ambassador to Syria, pointed to months of Israeli strikes on Syrian and Hezbollah targets in the area, and to Israel’s ceasefire with Hezbollah in Lebanon this week, as factors providing Syria’s opposition groups with the opportunity to advance.
Here's a look at some of the key aspects of the new fighting:
Why does the fighting at Aleppo matter? Assad has been at war with opposition forces seeking his overthrow for 13 years, a conflict that's killed an estimated half-million people. Some 6.8 million Syrians have fled the country, a refugee flow that helped change the political map in Europe by fueling anti-immigrant far-right movements.
The roughly 30% of the country not under Assad is controlled by a range of opposition forces and foreign troops. The US has about 900 troops in northeast Syria, far from Aleppo, to guard against a resurgence by the ISIS extremist group. Both the US and Israel conduct occasional strikes in Syria against government forces and Iran-allied militias. Türkiye has forces in Syria as well, and has influence with the broad alliance of opposition forces storming Aleppo.
Coming after years with few sizeable changes in territory between Syria's warring parties, the fighting “has the potential to be really quite, quite consequential and potentially game-changing,” if Syrian government forces prove unable to hold their ground, said Charles Lister, a longtime Syria analyst with the US-based Middle East Institute. Risks include if ISIS fighters see it as an opening, Lister said.
Ford said the fighting in Aleppo would become more broadly destabilizing if it drew Russia and Türkiye— each with its own interests to protect in Syria — into direct heavy fighting against each other. -
What do we know about the group leading the offensive on Aleppo? The US and UN have long designated the opposition force leading the attack at Aleppo — Hayat Tahrir al-Sham, known by its initials HTS — as a terrorist organization.
Its leader, Abu Mohammed al-Golani, emerged as the leader of al-Qaeda's Syria branch in 2011, in the first months of Syria's war. His fight was an unwelcome intervention to many in Syria's opposition, who hoped to keep the fight against Assad's brutal rule untainted by violent extremism.
Golani early on claimed responsibility for deadly bombings, pledged to attack Western forces and sent religious police to enforce modest dress by women.
Golani has sought to remake himself in recent years. He renounced his al-Qaeda ties in 2016. He's disbanded his religious police force, cracked down on extremist groups in his territory, and portrayed himself as a protector of other religions. That includes last year allowing the first Christian Mass in the city of Idlib in years.
What's the history of Aleppo in the war? At the crossroads of trade routes and empires for thousands of years, Aleppo is one of the centers of commerce and culture in the Middle East.
Aleppo was home to 2.3 million people before the war. Opposition forces seized the east side of the city in 2012, and it became the proudest symbol of the advance of armed opposition factions.
In 2016, government forces backed by Russian airstrikes laid siege to the city. Russian shells, missiles and crude barrel bombs — fuel canisters or other containers loaded with explosives and metal — methodically leveled neighborhoods. Starving and under siege, the opposition surrendered Aleppo that year.
The Russian military's entry was the turning point in the war, allowing Assad to stay on in the territory he held.
This year, Israeli airstrikes in Aleppo have hit Hezbollah weapons depots and Syrian forces, among other targets, according to an independent monitoring group. Israel rarely acknowledges strikes at Aleppo and other government-held areas of Syria.