That is what Kim Jong-un is thinking after having 7 of his past 8 Musudan missile launches end in failure:

North Korea’s supreme leader Kim Jong-un has ordered a full-blown investigation into the recent missile launch failures, South Korea’s Yonhap news agency reported, citing a North Korean defectors’ group. The test firing of two intermediate-range ballistic missiles, or Musudan, ended in failure about two weeks ago.

The investigation will reportedly include all those who were involved in the making of the missiles amid suspicion of a sabotage by the US and South Korea.  (………….)

“Officials and workers who engaged in the launches of the missiles are now banned from travelling and their mobiles phones are confiscated to check their conversation records,” he added.

The North Korean leader believes spies from the US and South Korea were responsible for the Musudan missile failures, he said. North Korean authorities believe the spies could have meddled with the missile parts that were imported from foreign countries, leading to the launch failure,   [IBT via reader tip]

You can read more at the link, but I guess we will see if they try and scapegoat someone for these missile launch failures and claim they were working for the US.