Ali Othman is among a shrinking band of Syrian rebels in the mountains across from this border town who face an agonizing choice: accept a settlement with a regime they revile or fight alongside al Qaeda’s Islamist allies.

The Syrian army defector and his fellow fighters say they are weakened and cornered after enduring months of bombardment from Russian forces buttressing President Bashar al-Assad’s regime. Peace talks ended last month without progress amid a major escalation in violence in the northern city of Aleppo. On Thursday, a day after the U.S. announced a deal with Russia on a fresh cease-fire in Aleppo, Islamist groups targeted regime-held areas of the city with rocket, mortar and sniper fire, according to Syrian state media and U.K.-based Syrian Observatory for Human Rights.

“My wife begs me almost each day to leave the mountains,” Mr. Othman, 26 years old, said during a recent visit with his family in Turkey. “She keeps asking me: `Why are you still fighting?’”

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WHEN Neda told her children that she might have to kill them, they assented. Such was their suffering after Islamic State kidnapped and enslaved them, along with thousands of other Yazidis, a religious minority, in northern Iraq in 2014. Neda’s husband was taken and presumably killed; her eldest son, just 13 years old, was forced to fight with the jihadists. She shaved off the hair and eyebrows of her two young daughters to make them look boyish and sickly, so that IS rapists might leave them alone. Neda herself was raped, beaten and sold several times before she was bought and freed by relatives last year.