Otto Warmbier, the college student released by North Korea while in a coma, suffered a “severe neurological” injury, according to the doctors who are treating him.

A medical team from the University of Cincinnati Medical Center described Otto Warmbier's condition as a "state of unresponsive wakefulness."

Warmbier, a University of Virginia student, was serving a 15-year sentence for allegedly trying to steal a banner containing a political slogan that was hanging from a wall in his Pyongyang hotel.

Former Ambassador to the United Nations John Bolton joined Stuart Varney on "Your World" today to react to North Korea's "barbaric" treatment of Warmbier.

"For goodness sakes, he took a sign," Bolton said. "To hold him that long, to sentence him after a kangaroo court trial to 15 years hard labor."

He noted that doctors said a lack of blood flow to Warmbier's brain occurred some time before April 2016, according to scans, which would be right after Warmbier was sentenced to hard labor in March 2016.

"Whether there's a connection there or not, I don't know," Bolton said. "But that coincidence in timing is interesting."

He added that it was cruel for North Korea to keep Warmbier in his comatose state for more than a year before returning him to the U.S.

"It's barbaric, but I have to say, it's typical for this regime," Bolton said. "This is a regime that's capable of almost anything. And our country will not be safe, nor will the region be safe, until this regime is gone."

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