Donald Trump makes history as the first sitting US President to enter North Korea

Donald Trump made history on Sunday as the first sitting US President to physically step foot into North Korea.

North Korean leader Kim Jong-un accepted Trump's invitation to revive discussions on the nation's nuclear programme. 

South Korea's President Moon also appeared at Sunday's meeting, despite being told by North Korea last week that would no longer be required as an intermediary between the two, CBS News reports.

The two leaders smiled and shook hands at the heavily guarded Demilitarised Zone before Trump entered North Korean territory by crossing the demarcation line. 

"I never expected to meet you at this place," Kim told Trump, according to CBS News.

"I believe this is an expression of his willingness to eliminate all the unfortunate past and open a new future.

"No one has expected this moment."

The photos of the two leaders standing side-by-side marks a return to face-to-face contact since their last physical meeting during a Vietnam summit in February.

"It was a great honour to step over the line, a lot of progress has been made," Trump told reporters as he and Kim concluded their meeting outside South Korea's Freedom House.

The President has reportedly said he will invite the North Korean leader to visit the White House.

Despite Trump's claims of "tremendous" improvement since his first meeting with Jim Jong Un last year, North Korea is yet to provide a record of its nuclear stockpile or disassemble its armory.

Newshub.