Russia launched a heavy aerial bombardment on Kyiv early Tuesday, causing widespread fires and damage across the Podil and Obolon districts.Moscow claims the systematic strikes are retaliation for a fatal drone explosion in Luhansk that killed 21 people, an accusation that Ukraine vehemently denies.Volodymyr Zelenskyy has urged citizens to remain alert as intelligence reports warn of further potential attacks against military and command centers.