Jake Sullivan, the White House national security adviser, told reporters the US had information indicating Tehran was "preparing to provide Russia with up to several hundred UAVs [unmanned aerial vehicle], on an expedited timeline".
"Our information further indicates that Iran is preparing to train Russian forces to use these UAVS, with initial training sessions slated to begin as soon as early July."
Sullivan said the information received by the US supported views that Russia's heavy bombardments in Ukraine, which have led it to consolidate gains in the country's east in recent weeks, were "coming at a cost to the sustainment of its own weapons".
He said it was not clear if Iran had yet delivered any of the drones to Russia. He noted that Iran's drones had been used by the Houthi rebels in Yemen to attack Saudi Arabia.
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