Russia has likely launched a number of Iranian-manufactured un-crewed aerial vehicles (UAVs) against Ukraine since September, Britain's Ministry of Defence said on Wednesday.
It's also likely that Russia has nearly exhausted its current stock of Iran-made weapons and will seek resupply, the ministry said in its daily intelligence update posted on Twitter.
The Russian attacks have been a combination of UAVs and traditional reusable armed systems, it added.
Ukraine has reported a spate of Russian attacks with Iranian-made Shahed-136 drones.
Iran's foreign minister acknowledged that his country supplied Russia with drones for the first time on November 5, insisting the transfer came before Moscow's invasion of Ukraine
Previously, Iranian officials had denied arming Russia in its war on Ukraine.