(Reuters) – Russian shelling in northern Ukraine killed four people in two villages in Sumy region near the Russian border, while a woman died in a fresh assault on the devastated eastern Ukrainian town of Avdiivka, local officials said. The local administration in Sumy region said three people died in mortar fire in the village of Znov-Novohorodske. A fourth was killed in another village to the southeast. Reuters could not verify the reports, but officials in Sumy region report daily attacks from Russian forces. In Avdiivka, a Ukrainian-held town near the front line, public broadcaster Suspil…