embarrassing failure a botched missile test, the weapon exploding seconds after launch, and tonight, questions about whether it was cyber-sabotaged by the u.s. there is a very strong belief that the americans, through cyber methods, have been successful on several occasions in interrupting these sort of tests and making them fail. reporter: tensions between the u.s. and north korea now at a dangerous high. north korea is a problem. the problem will be taken care of. reporter: but just what that means, unclear. the era of strategic patience is over. reporter: in south korea vice president pence visiting the demilitarized zone, delivering a warning of his own. just in the past few weeks, the world witnessed the resolve and the strength of our new president in actions taken in syria and afghanistan. north korea would do well not to test his resolve.