By Max Hunder, Sabine Siebold and Manuel Ausloos KYIV/BERLIN (Reuters) -"Drones, drones, drones. Only drones. A lot of drones." A weary Ukrainian platoon commander speaks to the transformed nature of modern warfare as he's medically evacuated from the front lines.

Moscow barreled hundreds of drones toward four key regions in Ukraine overnight, just as lawmakers in Kyiv scrambled to approve additional defense spending against the backdrop of intensified Russian attacks over the past few days.

A Ukrainian soldier told BI that the thermonaric warheads have gotten bigger, while a first responder said Russia is using them more frequently.