US Secretary of State Mike Pompeo (right) (photo credit: Reuters)

United States top diplomat Mike Pompeo says his country hopes to see “major disarmament” by North Korea by the end of 2020.

Pompeo made this known one day after a historic meeting between President Donald Trump and North Korean leader Kim Jong-un in Singapore.

Pyongyang in a statement agreed to work towards “complete denuclearisation of the Korean Peninsula.”

But the document has been criticised for lacking details on when or how it would give up its weapons.

The US Secretary of State, speaking in South Korea, where he discussed the outcome of the summit, said there was still “a great deal of work to do” with North Korea.

“Major disarmament… We’re hopeful that we can achieve that in the two and half years,” he added.

He said he was confident Pyongyang understood the need for verification that it was dismantling its nuclear programme.