Question: Who did the Soviet send to the country neighboring the country Mapado originated from?

full_context: Document 1: Names of Korea: An early attempt to translate these characters into English gave rise to the expression ``The Land of the Morning Calm ''for Korea, which parallels the expression`` The Land of the Rising Sun'' for Japan. While the wording is fanciful, the essence of the translation is valid.
Document 2: Geography of Vietnam: Vietnam is located on the eastern margin of the Indochinese peninsula and occupies about 331,211.6 square kilometers, of which about 25% was under cultivation in 1987. It borders the Gulf of Thailand, Gulf of Tonkin, and Pacific Sea, alongside China, Laos, and Cambodia. The S - shaped country has a north - to - south distance of 1,650 kilometers and is about 50 kilometers wide at the narrowest point. With a coastline of 3,260 kilometers, excluding islands, Vietnam claims 12 nautical miles (22.2 km; 13.8 mi) as the limit of its territorial waters, an additional 12 nautical miles (22.2 km; 13.8 mi) as a contiguous customs and security zone, and 200 nautical miles (370.4 km; 230.2 mi) as an exclusive economic zone.
Document 3: South Korea: South Korea occupies the southern portion of the Korean Peninsula, which extends some 1,100 km (680 mi) from the Asian mainland. This mountainous peninsula is flanked by the Yellow Sea to the west, and the Sea of Japan to the east. Its southern tip lies on the Korea Strait and the East China Sea.
Document 4: Geography of South Korea: South Korea is located in East Asia, on the southern half of the Korean Peninsula jutting out from the far east of the Asian land mass. The only country with a land border to South Korea is North Korea, lying to the north with 238 kilometres (148 mi) of border running along the Korean Demilitarized Zone. South Korea is mostly surrounded by water and has 2,413 kilometres (1,499 mi) of coast line along three seas; to the west is the Yellow Sea (known in Korea as West Sea), to the south is the East China Sea, and to the east is the Sea of Japan (known in Korea as East Sea). Geographically, South Korea's land mass is approximately 100,032 square kilometres (38,623 sq mi). 290 square kilometres (110 sq mi) of South Korea are occupied by water. The approximate coordinates are 37 ° North, 127 ° 30 East. Notable islands include Jeju Island (Jejudo), Ulleung Island (Ulleungdo), and Liancourt Rocks (Dokdo, known in Japan as Takeshima).
Document 5: Ri (administrative division): A ri or village is an administrative unit in both North Korea and South Korea similar to the unit of village.
Document 6: Jeju Province: Jeju Province, officially Jeju Special Self-Governing Province, is one of the nine provinces of South Korea. The province is situated on Jeju Island (; ), formerly transliterated as Cheju or Cheju Do, the country's largest island. It was previously known as Quelpart to Europeans and during the Japanese occupation as Saishū. The island lies in the Korea Strait, southwest of South Jeolla Province, of which it was a part before it became a separate province in 1946. Its capital is Jeju City.
Document 7: Korean War: On 7 June 1950, Kim Il-sung called for a Korea-wide election on 5–8 August 1950 and a consultative conference in Haeju on 15–17 June 1950. On 11 June, the North sent three diplomats to the South, as a peace overture that Rhee rejected. On 21 June, Kim Il-Sung revised his war plan to involve general attack across the 38th parallel, rather than a limited operation in the Ongjin peninsula. Kim was concerned that South Korean agents had learned about the plans and South Korean forces were strengthening their defenses. Stalin agreed to this change of plan.
Document 8: Korean War: Soviet generals with extensive combat experience from the Second World War were sent to North Korea as the Soviet Advisory Group. These generals completed the plans for the attack by May. The original plans called for a skirmish to be initiated in the Ongjin Peninsula on the west coast of Korea. The North Koreans would then launch a "counterattack" that would capture Seoul and encircle and destroy the South Korean army. The final stage would involve destroying South Korean government remnants, capturing the rest of South Korea, including the ports.
Document 9: Korean War: Although Kim's early successes had led him to predict that he would end the war by the end of August, Chinese leaders were more pessimistic. To counter a possible U.S. deployment, Zhou Enlai secured a Soviet commitment to have the Soviet Union support Chinese forces with air cover, and deployed 260,000 soldiers along the Korean border, under the command of Gao Gang. Zhou commanded Chai Chengwen to conduct a topographical survey of Korea, and directed Lei Yingfu, Zhou's military advisor in Korea, to analyze the military situation in Korea. Lei concluded that MacArthur would most likely attempt a landing at Incheon. After conferring with Mao that this would be MacArthur's most likely strategy, Zhou briefed Soviet and North Korean advisers of Lei's findings, and issued orders to Chinese army commanders deployed on the Korean border to prepare for American naval activity in the Korea Strait.
Document 10: Mapado: "Do" can either mean "province" or "island" in Korean. "Seom" means island in the Korean language as well, although "do" is a Sino-Korean word used in name compound words, but "seom" can stand alone. Filming for "Mapado" did not take place on an island, but in Dongbaek village in Yeonggwang County, South Korea.
Document 11: South Korea: The country, including all its islands, lies between latitudes 33 ° and 39 ° N, and longitudes 124 ° and 130 ° E. Its total area is 100,032 square kilometres (38,622.57 sq mi).
Document 12: Korean War: On 7 June 1950, Kim Il - sung called for a Korea - wide election on 5 -- 8 August 1950 and a consultative conference in Haeju on 15 -- 17 June 1950. On 11 June, the North sent three diplomats to the South as a peace overture that Rhee rejected outright. On 21 June, Kim Il - Sung revised his war plan to involve a general attack across the 38th parallel, rather than a limited operation in the Ongjin peninsula. Kim was concerned that South Korean agents learned about the plans and South Korean forces were strengthening their defenses. Stalin agreed to this change of plan.
Document 13: Geography of Japan: Japan is an island nation in East Asia comprising a volcanic archipelago extending along the continent's Pacific coast. It lies between 24 ° to 46 ° north latitude and from 123 ° to 146 ° east longitude. Japan is southeast of the Russian Far East, separated by the Sea of Okhotsk; slightly east of the Korean Peninsula, separated by the Sea of Japan; and east - northeast of China and Taiwan, separated by the East China Sea. The closest neighboring country to Japan is Russia.
Document 14: Korean War: On 18 September, Stalin dispatched General H. M. Zakharov to Korea to advise Kim Il-sung to halt his offensive around the Pusan perimeter and to redeploy his forces to defend Seoul. Chinese commanders were not briefed on North Korean troop numbers or operational plans. As the overall commander of Chinese forces, Zhou Enlai suggested that the North Koreans should attempt to eliminate the enemy forces at Inchon only if they had reserves of at least 100,000 men; otherwise, he advised the North Koreans to withdraw their forces north.
Document 15: Suseo-dong: Suseo-dong is a ward of Gangnam-gu in Seoul, South Korea. The name, "Suseo" originated from the feature of Han River running through the western part of the region. Suseo-dong is also home to the Tancheon park.
ground_truth: Soviet generals
sub_queries: What country did Mapado originate? Answer: South Korea
what are the neighboring countries of South Korea Answer: North Korea
Who did the Soviets send to North Korea ? Answer: Soviet generals