The attack hit the Northern Bridge, previously known as the Moscow Bridge, which connects several densely populated neighbourhoods including Troeshchyna and Obolon. Video footage showed the drone crashing into the bridge, triggering a large explosion and sending a plume of black smoke into the air as cars continued to cross. Soldiers later inspected a gaping hole in the highway.
Brushing off the attack, Merz, who was accompanied by a senior minister and several company executives, said his trip "demonstrates that we will not be intimidated. Nor will we be intimidated by a drone attack occurring at the very time of our visit."
The German chancellor announced military aid for Ukraine worth about £850 million ($1.6 billion) and a £300 million energy support package.
Russian assaults since Thursday have forced the full or partial closure of three of Kyiv's six road bridges, part of Moscow's latest effort to disrupt life in the capital. The Russian defence ministry claimed the bridge had been targeted because it was used to transport troops and military cargo.
The escalation in attacks comes after Ukrainian President Volodymyr Zelensky pledged to step up the bombing of Russian oil refineries.