The content originally appeared on: CNN (CNN)The southern Ukrainian city of Mykolaiv came under intense shelling in the early morning hours on Sunday, according to officials there, as Russian President Vladimir Putin used his nation's Navy Day to issue more militaristic threats to anyone undermining Russia's 'sovereignty and freedom.' Mykolaiv Mayor Oleksandr Senkevych said cluster munitions were blowing out windows and destroying balconies. 'Mykolaiv was under mass shelling today. Probably the strongest one of all time,' he said in a […]