South Korean President Moon Jae-in reiterated a proposal to formally end the Korean War in a speech at the U.N. on Tuesday, calling for the support of the U.S. and China.

“Today, I once again urge the international community to mobilize its strengths for the end-of-war declaration on the Korean Peninsula and propose that three parties of the two Koreas and the U.S., or four parties of the two Koreas, the U.S. and China, come together and declare that the war on the Korean Peninsula is over,” Moon said in his address to the 76th session of the U.N. General Assembly.