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The balloon has been spotted over U.S. airspace for a couple days, The Pentagon decided not to shoot it down due to risks of harm for people on the ground, officials said.
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Montes was highly regarded for her expertise on Cuba. But under the radar, she shared classified information with the Cuban government, including the identities of U.S. spies.
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Yanjun Xu was convicted last November of economic espionage by a federal jury in Ohio.
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This is the first time in U.S. history a former president has been investigated for possibly violating the 1917 law. But it's not the first time the Espionage Act has been under scrutiny, experts say.
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WikiLeaks said it would appeal. The decision is a big moment in Assange's years-long battle to avoid facing trial in the U.S. — though not necessarily the end of the tale.
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Russian United Nations Ambassador Vassily Nebenzia called it a "hostile" action.
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Polish spies helped free U.S. intelligence operatives captured in Iraq — and continue to play an unsung role in America's spycraft around the world.
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Reporter John Pomfret interviewed government officials and intelligence operatives and mined declassified files in Poland to write his fascinating story of the Polish-U.S. intelligence relationship.
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Analysts say the plane is another example of China's industrial espionage.
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China broke into tens of thousands of email accounts in January. Now officials fear the breach wasn't just about spying. It was to build the next generation of artificial intelligence.