Dr Steve Hurst insisted that self-contained North Korea is unlikely to allow American intrusion into Pyongyang, where US authorities are set to take away the country’s nuclear arsenal.
As Kim sets forth the bilateral agreement he signed with Mr Trump at the Singapore summit, the US would solely be responsible for disarming Kim – as the deal was only made between Pyongyang and Washington.
The US would then discard the weapons to ensure they are properly disposed off, and to stop North Korea’s engineers from detonating the weapons by accident.
John Bolton, US national security adviser, announced plans for Pyongyang’s nuclear weapons to be decommissioned at the Oak Ridge National Laboratory in Tennessee, where America’s old nukes are deactivated.
But Dr Hurst doubts the secretive North Korean leader and his personnel will allow this to happen.
He said: “It’s highly unlikely that the North Koreans would want to have US personnel actually on the ground to verify denuclearisation.
“Indeed no country is going to be happy to accept this kind of intrusion unless they have no choice, which isn’t the case here.
“So it will almost certainly be the case that the US will have to rely on technical verification measures.”
And Kim has not agreed exactly how he will honour the commitment.
Dr Hurst said: “The statement about denuclearization of the Korean peninsula is vague, susceptible to quite different interpretations and doesn’t go beyond what Kim had already said in previous statements.
“There needs to be a much more precise and concrete agreement spelling out exactly what denuclearization would look like before there would be anything to ratify.
“At that stage the International Atomic Energy Agency (IAEA) could be invited to play a role.
“But it is more likely to remain a bilateral agreement between the two countries, as nuclear arms reduction agreements between the US and the USSR used to be, for example.”
The deal, signed between the two world leaders, has not been given formal consent by the United Nations as of yet.
Mr Trump has agreed to work towards peace with Kim Jong-un, who has declared to abandon his country’s nuclear ambitions.
If Kim agreed to cooperate, North Korea’s weapons would have to be shipped under the supervision of a foreign army and navy to a disarmament facility overseas.
The weapons would be brought in using a crane, to a special building created to minimise the probability of radiation leakage.
Engineers would begin meticulously dismantling the warhead and the mechanism that activates the bomb.
Authorities would have to closely supervise the process, to ensure no weapons grade material is stolen.
Once dismantled, the plutonium could be used in power plans or kept in a “hot-room” before being disposed underground forever.