South Korean soldiers join a military exercise in Pocheon on September 19. (Photo: AFP/VNA)

Earlier, US Senator Rand Paul proposed that China be allowed to keep a peacekeeping force on the Korean border as part of a solution to the North Korea’s nuclear threats.

On Thursday, Malaysia's Ministry of Foreign Affairs banned citizens from travelling to North Korea until further notice. Sri Lanka has also prohibited online visas for North Korean citizens as part of the UN Security Council sanctions against Pyongyang’s missile and nuclear development programs.