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To make it clear to putin that if the russians allow this to continue from inside russia, the u.s. is going to respond. the u.s. has tremendous cyberwarfare capabilities. if they want to punish, hurt russia, they certainly can. the u.s. does not want to do that because if the u.s. does that, then russia will retaliate. it will get even worse. the u.s. has a lot more to lose in the process of these kinds of battles. but the threat will be there. putin will hear it i suspect in one form or another from the american president. >> wolf blitzer in geneva, we know you'll be there for a special editi...

>> reporter: u.s. officials are looking to place the blame on north korea, pulling the plug on its comedy "the interview," depicting the assassination of kim jong un. >> take him out. >> law enforcement sources say the blueprint of the current attack mimicked a hack against media organizations last year. according to a north korean defector, the north koreans have a vast secretive network of hackers around the world called bureau 121. >> unit 121 is a highly sophisticated organization under the military branch of the people's republic of north korea. and what this group is designed to do is to...