Drones sent by Russia killed four people in eastern Ukraine in attacks across multiple regions.
The Ukrainian military said on Saturday that 67 unmanned aerial vehicles were involved.
The governors of Donetsk and Dnipropetrovsk announced a total of four fatalities.
In Kyiv, fragments of a downed drone were found on the premises of the national parliament.
Meanwhile, the Wall Street Journal on Friday quoted US and European officials as saying that Iran has sent short-range ballistic missiles to Russia.
Reuters news agency also reported last month that Iran may deliver hundreds of missiles to Russia, citing European intelligence sources.
Moscow is believed to have received suicide drones from Iran. Russia is also expanding domestic production of unmanned aerial vehicles modeled on Iranian versions.