American espionage in the Soviet Union and Russian Federation

The United States of America has conducted espionage against the Soviet Union and its successor state, the Russian Federation.

Soviet Union
Throughout the Cold War, acts of espionage, or spying, became prevalent as tension between the United States and Soviet Union increased. Information played a crucial role in the Cold War and would be essential to a victory of either side. Both the United States and Soviet Union understood this fact and invested greatly in espionage missions and technology.

Russian Federation
According to U.S. government officials, as of 2016 the United States Intelligence Community had earmarked up to 10-percent of its budgets "to Russia-related espionage".

Incidents

 * In 2000 a former U.S. naval intelligence officer was convicted of espionage by a Russian court and sentenced to 20 years in prison, however, was later pardoned by Russian president Vladimir Putin. At the time of his arrest, the man had been seeking to purchase technical details about a Russian rocket-propelled torpedo; he later claimed he had only been seeking unclassified information regarding the torpedo for his technical consulting business.
 * In 2013 Ryan Fogle, the third secretary at the U.S. embassy in Moscow, was deported from Russia after Russian counterintelligence officers caught him carrying two wigs, three pairs of sunglasses, a Moscow street atlas, $130,000 in cash, and "a letter offering up to $1-million a year for long-term cooperation".
 * In 2017 a cybersecurity specialist working in the Federal Security Service was arrested by Russian authorities on suspicion of passing information to U.S. intelligence.