The CIA has a long history of helping to kill leaders around the world

Some of the most notorious of the CIA’s operations to kill world leaders were those targeting the late Cuban president, Fidel Castro.

Attempts ranged from snipers to imaginative plots worthy of spy movie fantasies, such as the famous exploding cigars and a poison-lined scuba-diving suit.

But although the CIA attempts proved fruitless in the case of Castro, the US intelligence agency has since 1945 succeeded in deposing or killing a string of leaders elsewhere around the world – either directly or, more often, using sympathetic local military, locally hired criminals or pliant dissidents.

According to North Korea’s ministry of state security, the CIA has not abandoned its old ways.

In a statement on Friday, it accused that the CIA and South Korea’s intelligence service of being behind an alleged recent an assassination attempt on its leader Kim Jong-un.

The attempt, according to the ministry, involved “the use of biochemical substances including radioactive substance and nano poisonous substance” and the advantage of this was it “does not require access to the target (as) their lethal results will appear after six or 12 months”.

The person directly responsible was allegedly a North Korean working for the foreign intelligence agencies.

A CIA spokesman refused to comment on the allegations.

But although such a claim cannot be dismissed as totally outlandish – given the long list of US involvement in coups and assassinations worldwide – the agency was forced to cut back on such killings after a US Senate investigation in the 1970s exposed the scale of its operations.