Ukrainian troops have withdrawn from Donetsk airport’s main terminal, scene of bitter fighting in recent weeks.
The government said the military still retained control of parts of the airport, but six soldiers had died and 16 had been wounded.
In the centre of the rebel-held city, shelling hit a bus, killing 13 people.
A spokesman for the president said he had called an emergency meeting to discuss the militia’s attacks, which Kiev believes are backed by Russia.
It was the second such meeting of the day.
“The plan how we will secure the end of operation of terrorist troops with the participation of regular troops of the Russian Federation… how to regroup forces and stop the aggression” will be adopted on Wednesday evening, Reuters news agency quoted President Petr Poroshenko as saying.
Earlier rebels paraded captured Ukrainian soldiers at the scene of the bus shelling, as onlookers shouted abuse and pelted them with debris from the blast site.
The rebels and the government traded blame for the attack, which comes nine days after a shell also killed 13 people on a bus in the village of Bugas outside Volnovaha, 35km (22 miles) south-west of Donetsk.
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