Paul Whelan was arrested Friday in Moscow, Russia said.

Whelan, 48, of Novi, Michigan, was arrested Friday in Moscow on suspicion of carrying out an act of espionage, Russia’s Federal Security Service (FSB) has said. His family rejects the accusation; Russia has not said exactly what Whelan is accused of doing.
Pompeo said Wednesday the US has “made clear to the Russians our expectation that we will learn more about the charges, come to understand what it is he’s been accused of, and if the detention is not appropriate, we will demand his immediate return.”
Pompeo’s remarks came in Brazil, where he had just met with incoming Brazilian Foreign Minister Ernesto Araujo.