US President Donald Trump has contradicted his own national security adviser, saying the so-called “Libya model” for denuclearisation is not being pursued with North Korea.
The suggestion by John Bolton angered the North, which threatened to pull out of a summit with Mr Trump next month.
Mr Trump said he still thought a summit would happen.
In 2003, Libya’s leader Muammar Gaddafi agreed to give up his nuclear programme in exchange for a lifting of sanctions.
However, he was killed by Western-backed rebels years later – a comparison that appears to have alarmed North Korean leader Kim Jong-un.
Pyongyang warned on Wednesday that it might not attend the talks, due to take place in Singapore on 12 June.