As Mr. Trump prepared to visit South Korea, Mr. Kim sent his foreign minister, Choe Son-hui, to Moscow. After she met with her Russian counterpart, Sergey Lavrov, on Monday, the two nations issued a press statement reaffirming “their will to accelerate the multifaceted development of the bilateral relations.”

North Korea's top diplomat has visited the Kremlin for talks with Russian President Vladimir Putin. The meeting follows last month's meeting between Putin and Kim Jong Un in Beijing.