Iran will not remain indifferent if it is proven that its drones are being used by Russia in the Ukraine war, the Iranian foreign minister said on Monday, amid allegations the Islamic Republic has supplied drones to Moscow to attack Ukraine.

"If it is proven to us that Iranian drones are being used in the Ukraine war against people, we should not remain indifferent," state media cited Hossein Amirabdollahian as saying.

However, Amirabdollahian said defense cooperation between Tehran and Moscow will continue.

Britain, France and Germany on Friday called for a United Nations probe of accusations Russia has used Iranian-origin drones to attack Ukraine, allegedly violating a U.N. Security Council resolution.

Citing diplomats and officials, Reuters reported last week that in addition to more drones, Iran had promised to provide Russia with surface-to-surface missiles.