The Kurdish People's Protection Units (YPG) and Arab allies yesterday night expelled Islamist and other rebel fighters from Minnigh air base and the adjacent town, north of Syria's second city Aleppo, said the Syrian Observatory for Human Rights.
"The takeover of Minnigh air base and the adjacent town overnight was backed by at least 30 Russian air strikes," said Observatory director Rami Abdel Rahman.
"There's some coordination between the Kurds and the Russians in Afrin region," he told AFP.
"With the defeat at Minnigh, Islamist fighters lost the only military airport they held in Aleppo province," Abdel Rahman said earlier.
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"Minnigh airport lies between two key roads that lead from Aleppo city to Azaz" to the north, giving Kurdish fighters a strategic launching pad for offensives against jihadists further east, he said.
Government forces lost control of the Minnigh airport in August 2013, two years after the uprising in Syria first erupted.
More than 500 people have been killed since the government began its Aleppo assault on February 1, the Observatory said yesterday.
YPG forces regularly clash with Islamist and jihadist fighters in northern Syria, but its most active front is further east against the Islamic State jihadist group.
Arab rebel groups have accused Kurdish fighters of ethnically cleansing towns to carve out autonomous Kurdish territories, a claim the YPG has fiercely denied.