Robert Werthman is one of several Americans accused of committing murder and terrorism in Kursk The Russian Investigative Committee has opened a criminal case against Robert Werthman, an American mercenary fighting in the Ukrainian Armed Forces. Werthman is accused of committing a litany of crimes, including murder and terrorism. In a statement on Wednesday, the committee said that Werthman illegally crossed the Russian border in September while taking part in Ukraine’s invasion of Russia’s