Iran has condemned President Volodymyr Zelensky’s remarks to the U.S. Congress, warning the Ukrainian leader against further accusing Tehran of supplying weapons to Russia for use in the war.

Mr. Zelensky told Congress on Wednesday that Iranian-made drones “sent to Russia in hundreds” had been threatening Ukraine’s critical infrastructure, a view shared by American and European officials. In Iran, he said, Russia had found an “ally in its genocidal policy.”

A spokesman for Iran’s foreign ministry, Nasser Kanaani, called Mr. Zelensky’s comments “rude” and “baseless.”

“Mr. Zelensky had better know that Iran’s strategic patience over such unfounded accusations is not endless,” Mr. Kanaani said in a statement on Thursday.

Although Iran has officially denied supplying Russia with the weapons since Moscow’s invasion of Ukraine, U.S. officials have said that the first shipment was delivered in August.

Mr. Zelensky has said that drones used in Monday’s wave of predawn attacks on Kyiv and other Ukrainian cities were from a batch recently delivered to Russia by Iran. The strikes came after Biden administration officials said that Russia and Iran were strengthening their military ties into a “full-fledged defense partnership.”

The European Union last week condemned Iran’s military partnership with Russia as a gross violation of international law and announced new sanctions against Iranian individuals and entities over their roles in supplying the drones that Moscow has used to attack Ukrainian civilians and infrastructure. That followed a round of sanctions on Iranians over the drone deliveries in October.

Mr. Kanaani “once again emphasizes” that Iran has not supplied military equipment for use in Ukraine, the statement issued on Thursday added, and urged Mr. Zelensky to learn “the fate of some other political leaders” who were happy with U.S. support. It was not clear which other leaders the statement was referring to.