Ukranian President Volodymyr Zelensky has accused Iran of 'lying' and 'terrorist co-operation' after Tehran admitted to supplying drones to Moscow.
For the first time Iran's foreign minister, Hossein Amirabdollahian, admitted his country had "provided a limited number of drones to Russia many months prior to the Ukraine war".
Iranian-made Shahed-136 drones have been spotted on the Ukrainian battlefield and it is believed they have been used to attack infrastructure and civilians.
In an address on his telegram channel, President Zelensky said:
"We know for sure that Iranian instructors taught Russian terrorists how to use drones, and Tehran is generally silent about it.
"And if Iran continues lying about the obvious, it means that the world will make even more efforts to investigate the terrorist cooperation between the Russian and Iranian regimes and what Russia is paying Iran for such cooperation.
"There will be no such thing in the modern world that any of the terrorists or their accomplices will remain unpunished."
When speaking to reporter in Tehran, the Iranian Foreign Minister said that Iran was oblivious to the use of its drones in Ukraine.
He added that "If (Ukraine) has any documents in their possession that Russia used Iranian drones in Ukraine, they should provide them to us,"
He said "If it is proven to us that Russia used Iranian drones in the war against Ukraine, we will not be indifferent to this issue."