By Pavel Polityuk IZIUM, Ukraine (Reuters) -Russia has widened its strikes on Ukrainian civilian infrastructure in the past week following setbacks on the battlefield and is likely to expand its target range further, Britain said on Sunday. Ukrainians who returned to the northeastern area retaken in Kyiv’s lightning advance earlier this month were searching for their dead while Russian artillery and air strikes kept pounding targets across Ukraine’s east. Five civilians were killed in Russian attacks in the eastern Donetsk region over the past day and in Nikopol, further west, several dozen re…