Guanbi policy
The Guanbi policy, also known as the closed port policy was a military blockade policy of the government of the Republic of China, now commonly known as Taiwan, against the Chinese Communist Party in the Communist-controlled Zone and later, the newly established People's Republic of China. The policy sought to restrict maritime access to ports controlled by the CCP and to disrupt trade and logistics to the PRC during the early Cold War period.
Background
Following the conclusion of the Chinese Civil War, the ROC government relocated to Taiwan while continuing to claim sovereignty over all of China, Mongolia, and other territories. In response to the establishment of the People’s Republic of China in October 1949, the ROC adopted a series of measures aimed at undermining the CCP’s economic and military consolidation. Among these was the declaration of a maritime closure on Communist-controlled ports, a policy that became known as the Guanbi policy.Declaration and scope
On 18 June 1949, the ROC government announced the closure of coastal ports under Communist control, initially covering the coastline from the Liao River in the north to the Min River in the south. The closure was enforced through naval patrols and aerial surveillance, and the designated area was later extended to include ports in Guangdong Province, extending the blockade to the entire Chinese coastline.Legal framing
The ROC government characterized the policy as a “port closure” rather than a formal blockade in order to avoid the legal implications of a declared state of war. Despite this distinction, foreign governments and legal scholars generally regarded the policy as a de facto naval blockade under international law.Implementation
In August 1950, the ROC Executive Yuan introduced regulations prohibiting ROC-registered vessels, shipping companies, and crews from engaging in trade with PRC-controlled ports. Additional enforcement measures were adopted in July 1962, further tightening restrictions on maritime traffic and authorizing naval interception of vessels suspected of violating the closure.Enforcement and incidents
ROC naval forces conducted patrols and interceptions in the Taiwan Strait and adjacent waters. Numerous foreign merchant vessels, including British, Polish, and Soviet ships, were stopped or detained, leading to diplomatic protests. These incidents attracted international attention and raised concerns regarding freedom of navigation and maritime neutrality.One of the most prominent cases associated with the policy was the 1954 seizure of the Soviet oil tanker Tuapse, which resulted in prolonged diplomatic disputes and allegations of unlawful detention of crew members.