Russian President Vladimir Putin's unprovoked war with Ukraine could come to a conclusion this year, according to a former US Army general who warned that the Kremlin would likely turn to the dire option of nuclear weapons if Moscow faces defeat in the conflict.Retired US Army Brig. Gen. Kevin Ryan told Insider on Tuesday that he believes that Russia "would use a nuclear weapon before it allowed its military to be defeated in the field."Putin has repeatedly threatened the use of nuclear weapons since he ordered the invasion of Ukraine in February 2022, but Ryan said that the Kremlin may...