Ukrainian cities of Kryvy Rih, Odesa, Kharkiv, and Mykolaiv face the greatest difficulties in preparing for the next heating season, primarily due to Russian attacks. These cities require maximum preparation for winter, says Oleksandr Kharchenko, Director of the Energy Research Center (ERA). “Kryvy Rih, Odesa, Kharkiv, and partially Mykolaiv are facing severe challenges," Kharchenko said during a briefing at Ukraine's Media Center in Kyiv.