U.S. semiconductor manufacturers should do more to keep their chips from illegally making their way into equipment used by the Russian military, U.S. Senator Richard Blumenthal said at a hearing on Tuesday.

Blumenthal’s comments came as reports showed U.S.-origin chips and other technology continue to be found in a wide range of Russian equipment on the battlefield in Ukraine, from drones and radios to missiles and armored vehicles.

His remarks were aimed at U.S. chipmakers like Advanced Micro Devices, Intel Corp, Texas Instruments and Analog Devices, after reports of their products in Russian equipment or flowing to Russia, despite U.S. export controls.

The companies “have the capacity to trace and track those components well enough to do something more,” Blumenthal, chair of the Senate’s Permanent Subcommittee on Investigations, said at the hearing looking into how U.S. chipmakers are complying with export restrictions imposed after Russia’s invasion in February 2022.

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