By Pavel Polityuk and Carlos Barria LVIV/IRPIN, Ukraine (Reuters) – Ukrainian officials said a Russian air strike hit a bread factory in northern Ukraine on Monday, killing at least 13 civilians, while talks between Kyiv and Moscow made little progress towards easing the conflict. The strike on the factory in Makariv, just west of the capital Kyiv, took place as the number of refugees fleeing across borders from the Russian assault on Ukraine passed 1.7 million, according to United Nations figures. Russian forces pressed on with their seiges and bombing of Ukrainian cities on the 11th day of t…