www.ropesgray.com/en/newsroom/alerts/2018/12/A-Review-Of-US-Economic-Sanctions-In-2018
www.state.gov/r/pa/prs/ps/2018/08/285043.htm
Update:
www.whitecase.com/publications/alert/us-imposes-additional-sanctions-russia-under-chemical-and-biological-weapons
www.crowell.com/NewsEvents/AlertsNewsletters/all/United-States-Ramps-Up-Sanctions-Pressure-on-Russia-and-Venezuela