Why a tiny river on Russia’s border tests China’s ties with Kim Jong-un (opens original article in a new tab)

The Tumen River, a natural border between China, North Korea, and Russia, remains a sensitive issue affecting China's access to the Sea of Japan, with recent summit discussions failing to address it.

• The Tumen River is a natural border between China, North Korea, and Russia, with a narrow strip blocking Chinese access to open waters.
• China has sought to open the waterway for access to the Sea of Japan, but North Korea and Russia remain wary of Beijing's influence.
• Recent discussions with Russia showed some progress, but the river was not mentioned in official statements after a recent China-North Korea summit.