Jeremy Corbyn's policy on nuclear weapons invites annihilation from belligerent countries such as North Korea, according to a former director-general at the Ministry of Defence.
Rear admiral Chris Parry also attacked Corbyn for "thinking you can sit down and have a nice chat" with the leader of Islamic State, and said Labour can't be trusted with the protection of this country.
Parry spoke to Julia Hartley-Brewer after Corbyn said he wouldn't proactively use the UK's nuclear deterrent, nor would he necessarily back a drone strike to kill the leader of Isis.
The military veteran said Labour are "strategically illiterate" on defence, adding that "to say we would only respond to a first strike is to invite annihilation.
"What Jeremy Corbyn seems to be saying is 'we'll let Kim Jong-un, when he gets his missiles, attack us first, and then we'll have a think about it.'"
He also suggested the Labour leader's stance on Isis is akin to the Allies trying to sit down for a chat with Adolf Hitler in 1944, rather than finishing the Nazis off.
Listen to the full interview to find out more