The United States is including 10 Switchblade drones armed with antitank warheads in its shipment of military hardware to Ukraine, according to a report on Monday.

The latest model Switchblade 600 drones are a part of the $300 million package of military equipment for Ukraine that was announced by the Pentagon on Friday, according to the report. The U.S. had previously committed to sending 100 of the weaker Switchblade 300 drones designed to take out personnel and light vehicles.

"Switchblade 600 represents the next generation of extended-range loitering missiles, delivering unprecedented [reconnaissance, surveillance, and target acquisition] support and featuring high-precision optics, over 40 minutes of loitering endurance, and an anti-armor warhead for engaging larger, hardened targets at greater distances," according to the drone's manufacturer, AeroVironment.

Unlike the new Switchblade 600 drones, the 300 series is only capable of 15 minutes of flight and has a range of 6 miles. Both models attack their targets by divebombing into them, destroying the drone.

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The report, citing two people familiar with the decision, said the tank-destroying drones will not be taken out of the existing U.S. arsenal but will rather be procured directly from the manufacturer.

A Ukrainian official on Sunday expressed frustration that the drones being sent by the Biden administration to Ukraine were at the time reported to be the weaker versions.

“This is the biggest issue,” a Ukrainian official told the Washington Examiner, speaking on condition of anonymity. “The Russians will bring all their capabilities to the battlefield ... and we have those ridiculous tactical drones.”

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Over the weekend, Ukrainian President Volodymyr Zelensky pleaded for the U.S. to convince NATO allies to provide Ukraine with more heavy artillery, such as Soviet-era tanks, to battle Russian forces expected to build up in eastern Ukraine.

“That would be a swift assistance and very quick support," Zelensky told CBS on Sunday. "I think the United States could influence that decision, and many European countries could make it happen."