A green train with yellow trimmings, resembling one used by North Korean leader Kim Jong Un on his previous travels, is seen steaming by a slogan which reads "Towards a new victory" on the North Korea border with Russia and China seen from China's Yiyanwang Three Kingdoms viewing platform in Fangchuan in northeastern China's Jilin province on Monday, Sept. 11, 2023. Russia and North Korea confirmed Monday that North Korean leader Kim Jong Un will visit Russia in a highly anticipated meeting with President Vladimir Putin that has sparked Western concerns about a potential arms deal for Moscow's war in Ukraine. (AP Photo/Ng Han Guan)

A green train with yellow trimmings, resembling one used by North Korean leader Kim Jong Un on his previous travels, is seen steaming by a slogan which reads "Towards a new victory" on the North Korea border with Russia and China seen from China's Yiyanwang Three Kingdoms viewing platform in Fangchuan in northeastern China's Jilin province on Monday, Sept. 11, 2023. Russia and North Korea confirmed Monday that North Korean leader Kim Jong Un will visit Russia in a highly anticipated meeting with President Vladimir Putin that has sparked Western concerns about a potential arms deal for Moscow's war in Ukraine. (AP Photo/Ng Han Guan)

A green train with yellow trimmings, resembling one used by North Korean leader Kim Jong Un on his previous travels, is seen steaming by a slogan which reads "Towards a new victory" on the North Korea border with Russia and China seen from China's Yiyanwang Three Kingdoms viewing platform in Fangchuan in northeastern China's Jilin province on Monday, Sept. 11, 2023. Russia and North Korea confirmed Monday that North Korean leader Kim Jong Un will visit Russia in a highly anticipated meeting with President Vladimir Putin that has sparked Western concerns about a potential arms deal for Moscow's war in Ukraine. (AP Photo/Ng Han Guan)

Fences are installed along a hill on the North Korea border with Russia and China, seen from China's Yiyanwang Three Kingdoms viewing platform in Fangchuan in northeastern China's Jilin province on Monday, Sept. 11, 2023. Russia and North Korea confirmed Monday that North Korean leader Kim Jong Un will visit Russia in a highly anticipated meeting with President Vladimir Putin that has sparked Western concerns about a potential arms deal for Moscow's war in Ukraine. (AP Photo/Ng Han Guan)