However, western and other sources estimate that about 400,000 Chinese soldiers were either killed in action or died of disease, starvation, exposure, and accidents with around 486,000 wounded, out of around 3 million military personnel deployed in the war by China. Mao Zedong's oldest and only healthy son, Mao Anying (毛岸英), was a PVA officer during the war, and was killed by a UN air strike. The war also contributed to the decline of Sino-Soviet relations. Although Chinese had their own reasons to enter the war (i.e. a strategic buffer zone in the Korean peninsula), the view that the Soviets had used them as proxies was shared in the Western bloc. China had to use Soviet loans originally intended to rebuild their shattered economy to pay for Soviet arms. After the war was over, 14,000 of the PVA POWs hostile to the PRC were provided the option to defect to Taiwan (the majority of whom were former Nationalist soldiers who fought against the Communists in the Chinese Civil War). In contrast, only 7,110 Chinese POWs opted to return to the PRC. The defectors began arriving in Taiwan on January 23, 1954 and were referred to as "Anti-Communist Martyrs" (反共義士). In Taiwan January 23 became World Freedom Day (自由日) in their honor. The Korean War also led to other long-lasting effects. Until the war, the US had largely abandoned the government of Chiang Kai-shek, which had retreated to Taiwan, and had no plans to intervene in the Chinese Civil War. The start of the Korean War rendered untenable any policy that would have caused Taiwan to fall under PRC control. Truman's decision to send American forces to the Taiwan Strait further deterred the PRC from making any cross-strait invasion of Taiwan. The anti-communist atmosphere in the West in response to the Korean War and Cold War contributed to the unwillingness to diplomatically recognize the People's Republic of China by the United States until 1979. Today, diplomacy between the Republic of China and mainland China remains strained, and mainland China continues to claim the sovereignty of Taiwan, although some progress has been made. "Who are the Most Beloved People?" is the title of an essay by Chinese writer Wei Wei about the Chinese soldiers serving in the Korean War. It is considered to be the most famous literary and propaganda piece produced by China during the Korean War.