More developments in the Russia election probe this week, as President Trump's former personal attorney Michael Cohen is sentenced to three years in a federal prison on a variety of charges. Russian national Maria Butina pleads guilty to conspiring to act as a foreign agent, following a deal with federal prosecutors. A gunman opens fire on the Strasbourg Christmas market in France, killing four and wounding about a dozen others. Plus -- the U.S. Senate passes a pair of resolutions related to U.S. involvement in the war in Yemen and the murder of dissident Saudi journalist Jamal Khashoggi. CBS News Correspondent Steve Dorsey will have these stories and more on the CBS News Weekend Roundup.