Chinese President ​Xi Jinping is set to visit North Korea on Monday ​for a summit, marking his first visit to ⁠the North in nearly seven years as Beijing looks to ​reinforce ties with Pyongyang, China’s only formal treaty ally.

Kim Yo ​Jong called US claims that Xi and US President Donald Trump confirmed a goal to denuclearise during a May summit “false,” adding that it “has the ​most accurate information” regarding the claims.

“The policy of continuously ​strengthening self-defensive nuclear war deterrence, as declared by the head of state, ‌is ⁠an irreversible and final conclusion that must be executed unconditionally,” she said.

Early this week, North Korea unveiled a new nuclear material production factory where its leader Kim called for an “exponential” expansion of ​the country’s ​atomic arsenal.

Analysts said ⁠the new uranium-enrichment site appeared aimed at reinforcing North Korea’s negotiating position ahead of the ​Xi-Kim summit while justifying an acceleration of its ​nuclear ⁠build-up.

Kim Jong Un also visited a major munitions factory and ordered the country’s missile production capacity to be increased 2.5 times ⁠over ​the next five years, Yonhap News ​Agency said on Sunday, citing North Korea’s state newspaper, The Rodong Sinmun.