Russia says on Monday its military hit Ukrainian air bases in overnight strikes and Ukrainian forces shelled industrial facilities inside Russia as both sides sought the upper hand ahead of what Kyiv hopes will be a decisive counter-offensive.
In a rare acknowledgement of damage to a military target, Ukraine says work is under way to restore a runway.
It also says five aircraft were taken out of service in the western region of Khmelnitskiy, though it did not name the sites.
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Russian state-owned news agency, RIA, reports that more than one air base had been hit.
There was no confirmation from Ukraine of damage to other air bases.
The Ukrainian capital came under attack for the 16th time this month after a second successive night of bombardment. However, officials said most of the drones and missiles fired overnight had been shot down and no targets were hit in the morning.
