By Riley Gutiérrez McDermid The breaking of U.S. guidelines could result in a maximum penalty of 20 years in prison, the government said. One of the first indictments of a Russian national violating sanctions has now happened, as global authorities step up their enforcement of bans put in place to slow or end the unprovoked invasion of Ukraine by Russia. The U.S., the European Union and the United Kingdom have all issued sweeping sanctions on people they believe to be close to the Kremlin or Russian President Vladimir Putin. Some of those are oligarchs are Russians made fabulously wealthy from…