Danger sirens throughout the day in Ukraine's two largest cities, Kyiv and Kharkiv are now scaring the whole world. The whole war is not revolving around the two largest cities of Ukraine, Kyiv, and Kharkiv, because Russia wants to capture them at any cost. Kyiv is the capital of Ukraine and also the largest city of Ukraine while Kharkiv is the second-largest city in Ukraine. Watch Vardat.