Maria Butina, seen in this courtroom sketch, stands beside her attorney Robert Driscoll during a court hearing late last year in Washington, D.C. The Russian woman has been released from prison after serving a sentence for conspiracy. Dana Verkouteren/AP hide caption
Russian agent Maria Butina in an undated booking photo in Alexandria, Va. U.S. District Judge Tanya Chutkan announced Thursday that Butina will be sentenced in late April. Alexandria Sheriff's Office via hide caption
Maria Butina walks with Alexander Torshin, then a member of the Russian upper house of Parliament, in Moscow in 2012. The Senate Finance Committee is now investigating a think tank linked to both of them. Pavel Ptitsin/AP hide caption
Paul Whelan, the American who has been detained by Russia on suspicion of espionage, stands in a glass cage for a hearing in Moscow on Tuesday. Sefa Karacan/Anadolu Agency/Getty Images hide caption
Ex-U.S. Marine Paul Whelan is being held in Moscow's Lefortovo prison on accusations of espionage by the Russian government. Sergey Ponomarev/AP hide caption
Maria Butina, photographed in 2013 at a pro-gun rally in Moscow, is charged with conspiring to act as a Russian agent. AP hide caption