He says several unidentified countries believe North Korea’s last six nuclear tests likely helped it develop such a capability.
A draft version of the report – by an independent UN sanctions monitoring group – was submitted to the UN Security Council on Monday and was seen by the Reuters news agency.
He also accuses North Korea of pursuing its nuclear ambitions, although it has not carried out nuclear tests for nearly three years.
The report states: “The Democratic People’s Republic of Korea continues its nuclear program, including the production of highly enriched uranium and the construction of an experimental light water reactor.
“One member state considered that the Democratic People’s Republic of Korea continues to produce nuclear weapons. ”
One country – not identified – believes that North Korea “could seek to further develop miniaturization in order to allow the incorporation of technological improvements … or, potentially, to develop several warhead systems”.
The secret communist state has been subject to UN sanctions for many years for its ballistic and nuclear missile programs.
North Korean leader Kim Jong Un has met with Donald Trump three times since 2018 in hopes that sanctions could be relaxed if that goes denuclearized, but a deal has proven elusive.
A summit in Vietnam in 2019 was cut short, with Mr. Trump saying it was because his counterpart wanted all sanctions lifted – a claim North Korea rejected.
The UN report also casts doubt on the effectiveness of the destruction of the tunnels at North Korea’s main nuclear site, Punggye-ri, in May 2018.
International experts were not allowed in and the report says only the tunnel entrances are known to have been destroyed rather than a complete demolition.
One country reportedly estimated that it would only take North Korea three months for the site to perform a nuclear test again.
With the North Korean economy still punished with sanctions, the report says it continues to break the rules and generate money through “illicit maritime coal exports,” as well as widespread piracy.
It is estimated to have stolen $ 2 billion (£ 1.7 billion) through cyber attacks targeting banks and cryptocurrency exchanges.
“The Panel continues to assess that virtual asset service providers and virtual assets will continue to remain lucrative targets for the Democratic People’s Republic of Korea to generate revenue, as well as to mine cryptocurrencies.” , did he declare.