The intelligence comes from the EU's allies, according to the union's spokesperson Peter Stano, who warns of new sanctions against Tehran if the drone deliveries are confirmed.
Already over the weekend, the Wall Street Journal wrote that the US has intelligence about Iranian weapon deliveries that the country has shared with its allies in Europe.
The Russian power headquarters, the Kremlin, responds cryptically to a question about Iranian drones to Russia.
It's not always the case that such information is true, says spokesperson Dmitrij Peskov to reporters in Moscow.
Iran is an important partner. We are developing our trade and economic relations, we are developing our cooperation and dialogue in all possible areas, including the most sensitive ones.
Tehran has denied the allegations and called it "psychological warfare", reports Iranian state media.
