Russian forces appear to be out of Iranian-made drones that have been used in recent weeks to terrorize Ukrainian cities and civilians, Western officials say.

One unnamed Western official said Tuesday that while Moscow has run out of the Iranian drones, it still anticipates “a resupply,” according to an ABC News report. The comments come amid a drop in usage for the deadly systems.

Yevgeny Silkin, a top Ukrainian military official, said recently that Russia had stopped using Iranian-made drones because they don’t work in cold weather, noting that they are constructed using plastic and other materials that are not resistant to frost.

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Britain’s defense ministry shared in a late-November intelligence update that there had been no public reports of “one way attack” (OWA) drone strikes since November 17, a reference to the Iranian-made explosive suicide drone Shahed-136 that became a weapon of choice for Russian President Vladimir Putin’s forces.

Read more: yahoo