A Syrian government warplane is reported to have been shot down as fighting continues in the rebel-held northern province of Idlib.
Opposition sources said the jet had been brought down near the town of Khan Sheikhoun.
Earlier reports said Russian-backed government forces had advanced to just a few kilometres from the town.
Nearly 30 combatants are said to have been killed in overnight fighting.
The Syrian Observatory for Human Rights, a UK-based monitoring group, said the pilot of the Russian-made Sukhoi warplane had been captured and was being held by the jihadist group Hayat Tahrir al-Sham (HTS), the dominant faction in Idlib Province.
Syria’s government, backed by Russia, is trying to recapture the region from rebels and jihadists.
Idlib, northern Hama and western Aleppo province make up the last opposition stronghold in Syria after eight years of civil war.
They are supposedly covered by a truce brokered in September by Russia and opposition-backer Turkey that spared the 2.7 million civilians living there from a major government offensive.
Civilian areas have been hit frequently since the Syrian government and Russia intensified their attacks earlier this year in response to what they said were repeated truce violations by jihadists linked to al-Qaeda, who dominate the region.
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