Russia has shot down two Ukrainian aircraft near the city of Izyum, the Russian defence ministry is quoted as saying.
And missile systems provided to Ukraine by an unnamed European country have been destroyed near Dnipro, with 25 Ukrainian soldiers hit as well, according to the Interfax news agency.
Four Ukrainian drones and a helicopter are said to have been taken out in other eastern areas of the country as well.
The BBC has not been able to independently verify the claims.
source:bbc