The Syrian military and its ally Russia conducted deadly joint air raids Monday on areas that Islamist-led rebels seized control of over the weekend. The strikes were a response to a lightning offensive by the rebels that saw them wrest control of swathes of northwest Syria from government forces.

The conflict that started more than a decade ago took a significant turn several days ago, catching many — including, it seems, Syrian dictator Bashar Assad and his Russian backers — by surprise. On Saturday, rebels, including many with the U.S.-designated Islamic terrorist group Hayat Tahrir Al-Sham (HTS), took control of the major city of Aleppo in northern Syria.

The rebels seized Aleppo’s airport and started pushing into towns and villages in the countryside around the city on Sunday after leaving piles of dead government soldiers in the streets. Observers said the rebel forces were often met with little to no resistance by regime forces, but by Monday the pace of the surprise offensive appeared to have slowed, with Assad and his Russian backers ramping-up their response.

Syrian rebels’ surprise offensive

Syria’s civil war began in 2011 after civilians led pro-democracy protests against Assad, and his government responded by opening fire on its own people. The ensuing war is thought to have killed around 500,000 people but, for the last several years, it had simmered as a stalemate. Government forces have controlled the west and south of the country, American-backed rebels have dominated the northeast, and Islamist rebel factions — including the ones now in control of Aleppo — have held most of the northwest.

“We are coming Damascus,” the rebels chanted Sunday, threatening to push on next toward Syria’s national capital and the Assad government’s stronghold.

The balance in the stalemate started changing last week, when the Islamist-led rebel alliance in the northwest launched its offensive. Over the weekend, HTS and allied factions took control of Aleppo city for the first time since the civil war started more than a decade ago, according to the Syrian Observatory for Human Rights war monitoring group’s director Rami Abdel Rahman.

Aleppo, an ancient city dominated by its landmark citadel, is home to two million people. It was the scene of fierce battles earlier in the conflict but, until Sunday, the rebels had never managed to totally seize it. Video showed rebels in military fatigues patrolling the streets of Aleppo, with some setting fire to a Syrian flag and others holding up the green, red, black and white flag of the revolution.

While the streets appeared mostly empty, some residents came out to cheer the advancing rebel fighters. HTS is an alliance led by al Qaeda’s former Syria branch. It’s fighting alongside allied factions, with units taking orders from a joint command.

Aron Lund of the Century International think tank said: “Aleppo seems to be lost for the regime.”

He added: “And a government without Aleppo is not really a functional government of Syria.”

The United States and its allies France, Germany and Britain called Sunday for “de-escalation” in Syria, and for the protection of civilians and infrastructure. The U.S. maintains hundreds of troops in northeast Syria as part of an anti-jihadist coalition, and it has also continued carrying out strikes against Islamist groups in the country.

Russia and Iran vow to help Syria’s Assad

Assad’s reaction to the surprise offensive was still building on Monday with the joint airstrikes carried out by his air force and his Russian allies, and expanded ground operations aimed at retaking towns and villages north of Aleppo said to be underway. 

Syrian-Russian air raids hammered several areas of both Aleppo and the neighboring Idlib provinces, killing at least 49 people, including 17 civilians, according to the Observatory.

“The strikes targeted… displaced families living on the edge of a displacement camp,” said Hussein Ahmed Khudur, a 45-year-old teacher who sought refuge at a camp in Idlib after fleeing fighting in Aleppo province. He said one of the five people killed in one strike was a student of his, and the other four were his four sisters.

Russia, which first intervened directly in the Syrian war in 2015, said Monday that it continued to support Assad.

“We of course continue to support Bashar al-Assad and we continue contacts at the appropriate levels, we are analyzing the situation,” Kremlin spokesman Dmitry Peskov told journalists.

Iran’s top diplomat Abbas Araghchi, was in Syria on Sunday to deliver a message of support, state media said.

On Monday, Iranian foreign ministry spokesman Esmail Baqaei said the Islamic republic had entered Syria at the official invitation of Assad’s government.

“Our military advisers were present in Syria, and they are still present. The presence of advisers from the Islamic Republic of Iran in Syria is not a new thing,” he said.

Same Syrian civil war, but very different times

While the fighting is rooted in a war that began more than a decade ago, much has changed since then. Millions of Syrians have become displaced, with around 5.5 million living in neighboring countries.

Most of those involved in the initial anti-Assad protests are either dead, living in exile or in jail.

Russia, meanwhile, is nearing the third year of its incredibly costly full-scale war on Ukraine, and Iran’s militant allies Hezbollah and Hamas have been massively weakened by more than a year of conflict with Israel.

On Monday, Iran’s foreign ministry said it would maintain its military support for the Syrian government.

But the role of Lebanon’s Hezbollah, which played a key role in backing the government particularly around Aleppo, remains in question particularly after it withdrew from several of its positions to focus on fighting Israel.

HTS and its allies began their offensive Wednesday, just as a ceasefire took effect in Lebanon after more than a year of war between Hezbollah and Israel.

The recent violence in Syria has killed some 244 rebels and 141 Syrian regime and allied fighters, along with at least 24 civilians, according to the Observatory, which has a network of sources inside Syria. The Observatory said rebel advances met little resistance.

Aaron Stein, president of the U.S.-based Foreign Policy Research Institute, said “Russia’s presence has thinned out considerably and quick reaction airstrikes have limited utility.”

He called the rebel advance “a reminder of how weak the [Assad] regime is.”

The airstrikes on Sunday on parts of Aleppo were the first since 2016.

contributed to this report.

Australian police seized a record 2.3 tons of cocaine and arrested 13 people in raids after the suspects’ boat broke down off the coast of Queensland, authorities said Monday.

The drugs had a sale value of 760 million Australian dollars ($494 million) and equaled as many as 11.7 million street deals if they had reached the country of 28 million people, federal police said in a statement.

Investigators told reporters in Brisbane that the drugs were transported from an unidentified South American country.

The arrests on Saturday and Sunday followed a monthlong investigation after a tipoff that the Comancheros motorcycle gang was planning a multi-ton smuggling operation, Australian Federal Police Commander Stephen Jay said. Police released photos and video of the operation, showing the cabin of the fishing boat loaded with huge packages of the alleged drugs.

The smugglers made two attempts to transport the drugs to Australia by sea from a mothership floating hundreds of miles offshore, Jay said. Their first boat broke down, and the second vessel foundered on Saturday, leaving the suspects stranded at sea for several hours until police raided the fishing boat and seized the drugs, he said.

The mothership was in international waters and was not apprehended, Jay said.

Authorities have seized more than one ton of cocaine before, Jay said, but the weekend’s haul was the biggest ever recorded in Australia.

Those charged are accused of conspiring to import the drug into Australia by sea and were due to appear in various courts on Monday. The maximum penalty under the charge is life in prison.

Some were arrested on the boat while others were waiting on shore to collect the cocaine, police said. Two were under age 18 and all were Australian citizens, they said.

“Australia is a very attractive market for organized criminal groups to send drugs such as cocaine,” Jay said.

The seizure marks the latest in a string of massive drug busts around the globe in recent days. On Wednesday, the Colombian navy announced that a authorities from dozens of countries seized over 225 metric tons of cocaine in a six-week mega-operation where they unearthed a new Pacific trafficking route from South America to Australia. Officials said they had also seized “increasingly sophisticated” drug-laden semisubmersibles — better known as “narco subs” — that can travel 10,000 miles without refueling.

Last week, Belgian authorities said they had seized almost five tons of cocaine stashed in shipping containers at Antwerp port, as part of a cross-border investigation into a drug-trafficking ring.

Just days before that, Spanish police said that they had seized 13 tons of cocaine — the country’s largest-ever haul of the drug — and made one arrest.