On March 5, 1953, Joseph Stalin died, and within weeks the Politburo of the Soviet Communist Party voted that the war in Korea should be ended. Mao Zedong received the news with dismay, but he knew that his army could not continue the war without Soviet assistance. With a speed that amazed the negotiating teams on both sides, the Chinese accepted voluntary repatriation. POWs who wanted to return to their homelands would be released immediately, and those who chose to stay would go into the custody of a neutral international agency for noncoercive screening. The Chinese and North Koreans also agreed to the exchange of sick and disabled POWs, which took place between April 20 and May 3.