Yevgeny Silkin, of the Joint Forces Command for Strategic Communications of the Armed Forces of Ukraine, said that Russia had stopped using the Iranian drones, which are made of plastic and other materials that are not frost resistant, according to Ukrainian news agency UNIAN.
The outlet said that the drones have not been used in Ukraine since November 17, which was also the first day that it snowed in Ukraine this year.
Winters in Ukraine can be cold, with mean temperatures often below freezing between December and March.
Russia started to use the Iranian drones in October, as part of a new playbook that targeted power distribution and other critical infrastructure from afar. Ukrainian civilians have also been killed by drone strikes.
Iran and Russia have denied any cooperation on weapons, but Iran later admitted that it had sent Russia weapons, adding that this was before Russia's invasion of Ukraine started.
Multiple reports and Western intelligence assessments have contradicted this.