A temporary suspension was declared after Russia warned it would treat coalition jets as potential targets.
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Syria
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But a Russian escort jet then intervenes, chasing away the Nato aircraft, Russian media reports say.
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Tensions in the region are rising as a battle develops for control over eastern Syria.
Read moreIranian TV shows a missile launch said to have targeted so-called Islamic State in Syria.
The World Health Organisation says the first outbreak in the country since 2014 is "very serious".
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The decision comes as Russia warns that it will treat US-led coalition jets as potential targets.
Read moreMoscow says it will track US-led coalition aircraft as targets, and halts a communications channel.
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Jonathan Marcus
Defence and diplomatic correspondent
A race is on to see who will dominate the territory that so-called Islamic State vacates.
Read moreSyrian family enjoying "precious gift" of knowing children are safe in Essex
A Syrian family who paid smugglers to hide their baby in a suitcase to get across the border to make their escape from the country say they're grateful to be given a new life in Essex.
Zak Al Halak, 34, and his family - one of fifteen families who've found refuge in the county - live in Brightlingsea.
The family came to England last Autumn from a refugee camp in Lebanon. Five years ago they had been forced to flee their Syrian home after it was engulfed in fierce fighting.
Mr Al Halak - speaking through an interpreter - said: "There was a battle and we were under siege for about six days inside our house.
"The shelling was continuous and the gunshots were like rain on us."
He said that these days the most precious gift is knowing his three children are safe.
"Everyone is treating us in a humane way," he said. "This is what we were missing because of the war in Syria."
Lamia Estatie
BBC News
Images of Syrian residents of Douma breaking fast surrounded by destroyed buildings are being shared online.
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