MOSCOW — An American citizen has been arrested in Moscow on suspicion of espionage, Russia’s domestic security service, the FSB, said on Monday.

The agency identified the man as Paul Whelan. A criminal case has been opened against him.

https://www.washingtonpost.com/world/europe/russia-arrests-american-citizen-on-suspicion-of-spying/2018/12/31/ba8ef51c-0ce9–11e9–831f-3aa2c2be4cbd_story.html?utm_term=.a872c01d9833

Tit for tat to get back at US for arresting Russian gun rights activist Maria Butina?