This photo provided by the Syrian Civil Defense group known as the White Helmets, shows a civil defense worker as smoke rises from a Syrian government airstrike on Sunday in Hobeit village, near Idlib, Syria. The White Helmets and a conflict monitoring group said Sunday that government and Russian forces have resumed their bombing of the opposition's last stretch of territory in the country, killing an infant girl and damaging a hospital. Credit: Syrian Civil Defense White Helmets via AP

BEIRUT — Syrian and Russian warplanes launched dozens of airstrikes on Syria’s northern province of Idlib on Saturday, a monitoring group said, intensifying pressure on the country’s last rebel stronghold after crisis talks yielded no progress.

At least seven civilians were dead after at least 80 airstrikes around the province’s southern edge, according to the Syrian Observatory for Human Rights. It said the violence was the “most intense” in weeks, with helicopters also dropping barrel bombs packed with shrapnel.

Pro-government forces have massed on the edges of Idlib, wedged into Syria’s northwest along the Turkish border. Syrian and Russian officials — key allies in Syria’s long conflict — appear to be preparing for an all-out assault to retake the area for good.

But there are deep fears that an attempt to reclaim Idlib could touch off major bloodshed and a humanitarian crisis among the area’s 3 million civilians, half of them displaced from elsewhere in Syria.

At a meeting in Tehran on Friday, the presidents of Russia, Iran and Turkey failed to agree on a cease-fire to halt the violence.

Although on different sides of the war, Turkey and Russia share an interest in preventing the situation from unraveling.

Turkey worries the violence could send hundreds of thousands of fleeing civilians to its border. Russia is wary of being drawn deeper into a bloody battle as it tells international partners that Syria is stabilizing and open for reconstruction.

The Observatory said Saturday that some 2,000 people were already on the move from areas being bombed, heading deeper into Idlib province.

Al-Qaida-linked rebels, known as Hayat Tahrir al-Sham, control more than half of Idlib, and much of the Russian and Syrian government rhetoric has focused on a need to defeat the group.

It is also home to a Turkey-backed coalition known as the National Liberation Front, as well as civilians who have left their previous homes instead of agreeing to “reconciliation” agreements with the government of Syrian President Bashar al-Assad. Many fear conscription or arrest.

The state-run Al-Ikhbariya TV said Saturday that the Syrian government was retaliating against rebel shelling on a government-held area south of Idlib. The barrage late Friday in Mhradah killed at least nine civilians, according to state media. The reports could not be independently verified.

“Renewed fighting in Idlib could produce suffering to rival the human misery seen in Aleppo, Eastern Ghouta and Raqqa,” said Fabrizio Carboni, regional director for the Near and Middle East at the International Committee of the Red Cross, in reference to the bloodiest battles of the seven-year war.

There were no signs that any side was backing down.

“We consider it unacceptable when the protection of the civilian population is used as a pretext for letting terrorists avoid a strike,” Russian President Vladimir Putin said at a news conference in Tehran on Friday.

Emad al-Moujahid, a spokesman for Hayat Tahrir al-Sham, described his organization as “part of the Syrian society” and vowed “military surprises” against Syrian and Russian forces.

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