US Secretary of State Mike Pompeo says America will help rebuild North Korea's economy if it agrees to give up its nuclear weapons.
The US would be "prepared to work with North Korea to achieve prosperity on the par with our South Korean friends".
Pompeo, who has just returned from Pyongyang, said he had "good" talks with North Korean leader Kim Jong‑un.
Kim and President Donald Trump will meet in Singapore on 12 June.
The two leaders, who had previously exchanged insults and threats, made the announcement after landmark talks between North and South Korea in April.
