U.S. and Chinese Foreign Policy EPI 7: Buffer State, China and the North Korea Question

In this episode of U.S. and Chinese Foreign Policy, we cover the relationship that tests every Chinese foreign-policy instrument at once: China and North Korea. The episode  opens with the framing question, can China restrain North Korea, and does Beijing lack the will or the capacity, then answers it through history and hard numbers. Chinaentered the Korean War in 1950 and lost over 300,000 soldiers, yet the DPRK’s official history omits the Chinese dead entirely. The 1961 Treaty of Friendship remains China’s only mutual defense treaty with any nation, with Article IIpromising automatic military assistance by all means at its disposal. And the dependence is staggering: China accounts for 84 percent of North Korean exports and 99 percent of imports, yet the trade data around six nuclear tests from2006 to 2017 show Beijing declining to use the leverage it holds. The readings explain why. The Council on Foreign Relations backgrounder frames seventy-five years of strained ties and concludes that many analysts now see North Korea as more of a liability for China than a valuable ally. The USCC Strategic Rift report documents the distrust beneath the fraternal language: the 2018 American summits rekindled Beijing’s deepest fear, a Pyongyang realigning with Washington, complete with reports of North Korea calling Chinaits thousand-year enemy, and China answered by engineering dependence, undermining the very sanctions it voted for to keep more than 90 percent of the North’s trade. Seong-Hyon Lee’s Lowy Institute analysis marks the 2026 turn: Beijing has abandoned its reluctant-mediator posture and now embraces the nuclear arsenal as a durable buffer against Washington, reconstituting the relationship as an ideological fortress that shields Pyongyang from pressure. Robert Kelly’s Bulletin of the Atomic Scientists analysis raises the stakes, showing howconventional inferiority and the use-it-or-lose-it dilemma push North Korea toward nuclear first use, the doctrine it codified into law in September 2022. The throughline connects this episode to the patience-as-strategy finding from the previous episode in this series and the alliance-avoidance logic traced through the earlier episodes in this series. China lectures the world on non-alliance while holding exactly one mutual defense treaty, and the gap between that treaty’s paper automaticity and Beijing’s actual hedging is the cleanest measure of the relationship. The debate question now arriving with theSeptember 2026 simulation is what happens when the buffer state China protects, and cannot control, threatens to use the most dangerous veto in Northeast Asia. This episode was created using the following referencematerials: “The China-North Korea Relationship.” Council on Foreign Relations Backgrounder, updated November 21, 2024. Frohman, Ben, Emma Rafaelof, and Alexis Dale-Huang. “The China-North Korea Strategic Rift: Background and Implications for the United States.” U.S.-China Economic andSecurity Review Commission Staff Report, January 24, 2022. Kelly, Robert E. “Why North Korea May Use Nuclear Weapons First, and Why Current US Policy toward Pyongyang Is Unsustainable.” Bulletin of the Atomic Scientists, November21, 2023. Lee, Sangsoo. “North Korea Is Joining China and Russia in Confronting the US.” 38 North, March 2, 2022. Lee, Seong-Hyon. “Why China Now Embraces a Nuclear North Korea.” Lowy Institute, The Interpreter, April 23, 2026. Bennett, Bruce W. “North Korea and China Aren’t the Allies You Think They Are.” RAND Commentary, September 27, 2023. Treaty of Friendship, Co-operation and Mutual Assistance Between the People’s Republic of China and the Democratic People’s Republic of Korea. Signed at Peking, July 11, 1961.