LOS ANGELES - A jury imposed the death penalty Tuesday on the ringleaders of a kidnapping-for-ransom scheme targeting rich Russian immigrants whose bodies were found in a Northern California reservoir. Jurors deliberated less than a day before reaching their vote on sentences for Iouri Mikhel, 41, and Jurijus Kadamovas, 40. Last month, the federal jury convicted both men of three counts of hostage-taking resulting in death and three counts of conspiracy. The death penalty verdict is binding on U.S. District Judge Dickran Tevrizian, who is scheduled to formally sentence the two men March 12. The case will be automatically appealed,...