PYONGYANG - North Korea is unlikely to fully give up its nuclear weapons, a US intelligence report says, despite the hopes of the Trump administration.

The Worldwide Threat Assessment report also says Iran is not making nuclear weapons, but that cyber threats from China and Russia are a growing concern.

Both countries may be seeking to influence the 2020 election, it says.

National intelligence director Dan Coats and other intelligence chiefs presented it to the Senate on Tuesday.

North Korea remains "unlikely to give up" its weapon stockpiles and production abilities while it tries to negotiate "partial denuclearisation steps to obtain key US and international concessions", the report says.

Having nuclear weapons is seen as "critical to regime survival", it reads.

President Donald Trump and North Korea's Kim Jong-un met in Singapore last June to discuss denuclearisation of the Korean peninsula.

At the time, Mr Trump claimed this meeting had ended the North Korean nuclear threat:

The two leaders signed an agreement pledging to "work toward complete denuclearisation" but there was no agreed pathway and little progress has been made since then on the issue.(FA)