In a statement Wednesday, State Department spokeswoman Heather Nauert said the US had made this decision on Monday, and accused Russia of violating international law. The statement anticipated the sanctions would go into effect around Aug. 22 in line with the Chemical and Biological Weapons Control and Warfare Elimination Act of 1991.
Sergei Skripal, a former Russian spy, and his daughter Yulia Skripal were hospitalized and treated for a nerve-agent attack in March. Yulia Skripal was discharged from the hospital in April, and her father was discharged in May.
The State Department notified Congress on Wednesday of the first of two potential tranches of sanctions required under the 1991 law. Unless Russia takes certain steps, a second set of penalties -- more stringent than this first round -- must follow, according to the law.