SEOUL—North Korea said on Friday it would sever diplomatic relations with Malaysia after the Southeast Asian nation extradited a North Korean man to the United States to face money-laundering charges this week. Malaysia denounced North Korea’s move as unwarranted and disruptive to regional peace, adding that the extradition had been carried out according to law. North Korea did not name its citizen in a statement carried by state media KCNA, but Malaysia said Mun Chol Myong, who was arrested in 2019, was extradited on Wednesday after he had already exhausted several legal appeals. “Malaysia denounces (North Korea’s) decision as unfriendly and unconstructive, disrespecting the spirit of mutual respect and good neighbourly relations among members of the international community,” its foreign ministry said in a statement. It said Malaysia would close its embassy in Pyongyang in response and order all diplomatic staff at the North Korean embassy in Kuala Lumpur to …