Gunfire and explosions were reported after armed pro-Russian separatists took over the international terminal at Donetsk airport in the early hours of Monday morning.
According to Kyiv, the Ukrainian army has launched an anti-terrorist operation at the airport, which lies in the country’s crisis-ridden east.
A press officer for the anti-terror operation confirmed an MIG-29 jet fighter was used to attack the rebels’ positions.
Airport authorities confirmed all flights were halted after the separatists came to the terminal to demand the withdrawal of the Ukrainian forces patrolling the perimeter.
Passengers have been left stranded, some saying they have received no real explanation for the disruption.
The incident came a day after the Ukrainian presidential elections, which the rebels say they refuse to recognise.
Donetsk lies in the Donbass industrial belt, which is largely controlled by pro-Russian separatists; many of whom are said to have prevented locals from going to the polls.