AP Photo

In the past four years, Russia’s intelligence services have stepped up a campaign of intimidation and dirty tricks against U.S. officials and diplomats in Russia and the countries that used to form the Soviet Union.

U.S. diplomats and officials have found their homes broken into and vandalized, or altered in ways as trivial as bathroom use; faced anonymous or veiled threats; and in some cases found themselves set up in compromising photos or videos that are later leaked to the local press and presented as a sex scandal.