Edit: nevermind, not from the Guardian article. It actually does directly mention microwaves: > The Russian security services were also known to flood the U.S

Edit: nevermind, not from the Guardian article. It actually does directly mention microwaves: > The Russian security services were also known to flood the U.S. embassy in Moscow with electromagnetic radiation. They would beam concentrated microwaves and electronic pulses at the Embassy in an attempt to eavesdrop on U.S. typewriters and conversations.