During the Cold War, and more precisely in the period 1953 - 1976, beams of microwaves of 2.5 to 4.0 GHz were aimed at the US embassy building in Moscow, Russia

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During the Cold War, and more precisely in the period 1953 - 1976, beams of microwaves of 2.5 to 4.0 GHz were aimed at the US embassy building in Moscow, Russia. The sources were located in a neighbouring apartment building. Those microwaves might have been used to remotely charge the batteries of the microphones concealed in the building.