Shortly after his conviction in 2011 on charges including conspiring to kill American citizens, the Russian arms dealer Viktor Bout relayed a defiant message through his lawyer, even though he faced the prospect of decades in prison.
Mr. Bout, his lawyer said, “believes this is not the end.”
More than a decade later, Mr. Bout, 55, may be nearing a chance for a new beginning, even though he has served less than half of his 25-year prison sentence.
The United States, trying to negotiate the…