Many of Ukraine's residents were awakened on Sunday morning by flight alarms - they sounded in almost all regions of the country.
In most places the alarms were later sounded, but in western Ukraine several Russian attacks were carried out.
At least 35 people were killed in a Russian attack on a military base in Javoriv - just a few miles from the Polish border.
An airfield in Ivano-Frankivsk was also hit by Russian shelling.
Fighting and air strikes in several cities
In eastern and central Ukraine, fierce fighting continues between the Russian and Ukrainian military.
Some evacuations have also been carried out during the day.
But the besieged city of Mariupol is still isolated.
Attempts to send supplies and evacuate civilians failed - again.
Several previous evacuations have been called off after Russian shelling, according to Ukrainian authorities.
The city government describes the situation as very difficult.
The power supply is said to be cut off, and the food and water reserves are about to run out.
Information on Russian attacks comes from cities such as Chernihiv and Mykolaiv.
Among other things, several residential buildings, as well as a school, have been hit by airstrikes.
American journalist shot dead
The fighting has continued in the area around Ukraine as well.
Video journalist Brent Renaud was shot dead in the city of Irpin.
Two more journalists are said to have been injured in the attack.
US President Joe Biden's security adviser Jake Sullivan called the incident "shocking and frightening".
New calls on Monday
Positive signals regarding the talks between Ukraine and Russia have come during the day.
Delegates from both Russia and Ukraine have expressed that progress is being made and that it is believed that an agreement between the countries is within reach.
According to the Kremlin, the delegations will have a video meeting on Monday.