U.S. House of Representatives Speaker Nancy Pelosi said Monday that Iran is "making a big mistake" by supplying Russia with drones that are targeting Ukraine’s infrastructure.

"We’ve been trying for a while now to have a nuclear agreement with Iran so that we can make the world a safer place and now they’re going off aiding the Russians and making the world a less safe place," Pelosi said in Zagreb, Croatia.

The United States and key Western allies have accused Russia of using Iranian-made drones to attack civilians and power plants in Ukraine. Iran has denied it is supplying Russia with the explosive-laden missiles but the distinctive triangle-shaped drones have been seen.

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"First of all, we have to be able to counter the drones," Pelosi said at a joint press conference with Croatian Prime Minister Andrej Plenkovic. "It is a dangerous technology and it must be stopped."

Pelosi was in Croatia to attend an international forum aimed at supporting Ukraine’s independence in the face of the Russian aggression.