Heavy artillery fire has been heard over the north of Donetsk in eastern Ukraine, and a large plume of black smoke was seen over the airport, Reuters reports.
Last night a second convoy of trucks from Russia rolled into Ukraine.
Ukraine is "still in a state of war" with neighbouring Russia despite a cease-fire between Kiev's forces and Moscow-backed rebels in the east, the country's prime minister said as a second convoy of Russian trucks rolled into Ukraine.
Speaking at a conference with politicians and business leaders in Kiev, Arseniy Yatsenyuk said Russian President Vladimir Putin's goal is "to take the entire Ukraine".
Donetsk city council said there had been fighting near the airport overnight. Two shells hit homes in the area but there were no reports of casualities.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.