The three countries said that they have "privately and publicly been clear that we would take new and significant measures against Iran if the transfers took place."
The U.K., France, and Germany will impose further sanctions on Iran due to confirmation that Moscow has received ballistic missiles from Tehran, the three countries said in a joint statement on Sept. 10.
Washington confirmed on Sept. 10 earlier media reports that Russia had received shipments of Iranian ballistic missiles.
The confirmation of the deliveries marks a "further escalation of Iran's military support to Russia's war of aggression against Ukraine," the U.K., France, and Germany said.
The three countries said that they have "privately and publicly been clear that we would take new and significant measures against Iran if the transfers took place."