Russian attacks on cities in Ukraine's east and southeast have killed four people and set ablaze a residence and a shopping centre.
Prosecutors in the Donetsk region, the focal point of Ukraine's front line, said three people died in two bomb attacks in the city of Sloviansk on Tuesday and five were injured.
Sloviansk is part of the country's "fortress belt", heavily defended by the military and seen as key to containing a slow-moving Russian offensive in Donetsk.
