Question: Information:  - North Korea, officially the Democratic People's Republic of Korea (DPRK ), is a country in East Asia, in the northern part of the Korean Peninsula. Pyongyang is both the nation's capital as well as its largest city. To the north and northwest the country is bordered by China and by Russia along the Amnok (known as the Yalu in China) and Tumen rivers. The country is bordered to the south by South Korea, with the heavily fortified Korean Demilitarized Zone (DMZ) separating the two.  - The Korean War (in South Korean , "Korean War"; in North Korean , "Fatherland Liberation War"; 25 June 1950  27 July 1953) began when North Korea invaded South Korea. The United Nations, with the United States as the principal force, came to the aid of South Korea. China came to the aid of North Korea, and the Soviet Union gave some assistance.  - South Korea, officially the Republic of Korea (ROK), is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula.  - The Blockade of Wonsan , or the Siege of Wonsan , from February 16 , 1951 to July 27 , 1953 , during the Korean War , was the longest naval blockade in modern history , lasting 861 days . UN naval forces , primarily from the United States , successfully kept the strategically important city of Wonsan from being used by the North Korean Navy . The blockade also served to divert communist troops from the front line . North Korean resistance used artillery to oppose the American fleet , although this was mostly ineffective , and the city was heavily damaged by UN naval aircraft and warships .  - Wnsan is a port city and naval base located in Kangwn Province, North Korea, along the eastern side of the Korean Peninsula, on the Sea of Japan (East Sea) and the provincial capital. The port was opened by occupying Japanese forces in 1880. Before the 19501953 Korean War, it fell within the jurisdiction of the then South Hamgyng province, and during the war it was the location of the Blockade of Wnsan. The population of the city was estimated at 331,000 in 2000. Notable people from Wnsan include Kim Ki Nam, diplomat and Secretary of the Korean Workers' Party. The city has several major factories.  - Japan ("Nippon" or "Nihon" ; formally "" or "Nihon-koku", means "State of Japan") is a sovereign island nation in Eastern Asia. Located in the Pacific Ocean, It is lying off the eastern coast of the Asia Mainland (east of China, Korea, Russia) and stretching from the Sea of Okhotsk in the north to the East China Sea and near Taiwan in the southwest.   - The Sea of Japan (see below for other names) is a marginal sea between the Japanese archipelago, Sakhalin, and the Asian mainland. The Japanese archipelago separates the sea from the Pacific Ocean. It is bordered by Japan, North Korea, Russia and South Korea. Like the Mediterranean Sea, it has almost no tides due to its nearly complete enclosure from the Pacific Ocean. This isolation also reflects in the fauna species and in the water salinity, which is lower than in the ocean. The sea has no large islands, bays or capes. Its water balance is mostly determined by the inflow and outflow through the straits connecting it to the neighboring seas and Pacific Ocean. Few rivers discharge into the sea and their total contribution to the water exchange is within 1%.  - The United Nations (UN) is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict. At its founding, the UN had 51 member states; there are now 193. The headquarters of the United Nations is in Manhattan, New York City, and experiences extraterritoriality. Further main offices are situated in Geneva, Nairobi, and Vienna. The organization is financed by assessed and voluntary contributions from its member states. Its objectives include maintaining international peace and security, promoting human rights, fostering social and economic development, protecting the environment, and providing humanitarian aid in cases of famine, natural disaster, and armed conflict.    Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'blockade of wonsan'.  Choices: - 1  - base  - blockade  - capital  - city  - conflict  - country  - demilitarized zone  - disaster  - economic development  - exchange  - headquarters  - human  - humanitarian aid  - island nation  - june  - jurisdiction  - korea  - league  - location  - lying  - marginal sea  - mediterranean sea  - member  - october  - operation  - order  - organization  - people  - port  - port city  - principal  - republic  - sea  - sovereign state  - state  - the city  - two  - war  - water  - world war
Answer:
conflict