Question: To which country belong the county-level city Yanji, east of Jilin Province and a city in west-central Liaoning province known as Beizhen?

full_context: Document 1: Hunchun: Hunchun is a county-level city in the Yanbian Korean Autonomous Prefecture, far eastern Jilin province, Northeast China. It borders North Korea (North Hamgyong province) and Russia (Primorsky Krai), has over 250,000 inhabitants, and covers 5,145 square kilometers. It was capital of Balhae/Bohai Kingdom between 785-793 as "Dongyang". The city's name Hunchun comes from the Manchu language meaning "borderland".
Document 2: Yanji: Yanji ("Yeon-gil" or "Yenji" in Korean, formerly romanized as Yenki) is a county-level city in the east of China's Jilin Province, and is the seat of the Yanbian Korean Autonomous Prefecture. Its population is approximately 400,000 of which a large portion is ethnic Korean. Yanji is a busy hub of transport and trade between China and North Korea.
Document 3: Liaoxi Province: Liaoxi () was a former province in Northeast China, located in what is now part of Liaoning and Jilin provinces. It existed from 1949 to 1954, and its capital was Jinzhou.
Document 4: Liaoning: Liaoning () is a province of China, located in the northeast of the country. The modern province was established in 1907 as Fengtian or Fengtien province and the name was changed to Liaoning in 1929. It was also known as Mukden province at the time, for the Manchu pronunciation of Shengjing, the former name of the provincial capital Shenyang. Under the Japanese-puppet Manchukuo regime, the province reverted to its 1907 name but the name Liaoning was restored in 1945 and again in 1954.
Document 5: Yanji Chaoyangchuan International Airport: Yanji Chaoyangchuan International Airport (IATA: YNJ, ICAO: ZYYJ) is an airport serving the city of Yanji in Jilin province of Northeast China.
Document 6: Taonan: Taonan (), formerly Tao'an County (洮安县), is a county-level city of 100,000 in the northwest of Jilin province in Northeast China. It is under the administration of Baicheng prefecture-level city.
Document 7: Panjin: Panjin () is a prefecture-level city and a major oil production centre of Liaoning province, People's Republic of China, and is situated on the northern coast of Liaodong Bay of the Bohai Gulf. It borders Anshan to the northeast and east, Yingkou across the Liao River, as well as Jinzhou to the west and northwest. The city has an administrative area of 4071 km2 , is home to 1.39 million people all in the built-up area made of 2 urban districts plus Dawa and Panshan Counties being urbanized.
Document 8: Beizhen: Beizhen () is a city in west-central Liaoning province of Northeast China. It is under the administration of Jinzhou City.
Document 9: Yanjiao: Yanjiao () is a town under the administration of Sanhe City in central Hebei province, bordering Tongzhou District, Beijing across the Chaobai River to the west, located 35 km east of Tiananmen Square and 21 km west of Sanhe. It has a population of 250,000, with long-term residents accounting for 147,000 and migrants taking the rest; 97.9% of the population is of Han ethnicity. , it has 55 villages under its administration.
Document 10: Xinzhou: Xinzhou () is a prefecture-level city occupying the north-central section of Shanxi province, People's Republic of China.
Document 11: Bei'an: Bei'an () is a county-level city in west-central Heilongjiang province in the People's Republic of China. It is under the jurisdiction of Heihe.
Document 12: Yanbian Korean Autonomous Prefecture: Yanbian (; Chinese Korean: 연변 , "Yeonbyeon") is an autonomous prefecture in northeastern Jilin Province, China. Yanbian is bordered to the north by Heilongjiang, on the west by Baishan and Jilin City, on the south by North Hamgyong Province of North Korea, and on the east by Primorsky Krai of Russia. Yanbian is designated as an autonomous prefecture due to the large number of ethnic Koreans living in the region. The prefectural capital is Yanji, and the total area is 42,700 km2 .
Document 13: Tumen, Jilin: Tumen is a county-level city in Yanbian Korean Autonomous Prefecture, eastern Jilin province, Northeast China. Of its 136,000 inhabitants, approximately 78,000 (or 57%) are of Korean descent. The two official languages are Chinese and Korean. Tumen is separated from Namyang of North Hamgyong province of North Korea by the Tumen River. Due to this proximity, many North Koreans escaping their country pass through Tumen. Tumen is also the location of a large detention center for captured North Koreans awaiting deportation. Tumen has two major food markets, the South Market and the North Market, where most of the residents purchase their food. Packaged foods and meats are usually sold inside the building, and vegetables are sold outside. There are six elementary schools, with three Korean schools, and three Chinese schools.
Document 14: Beijing: Beijing, ( ) formerly romanized as Peking, is the capital of the People's Republic of China and the world's second most populous city proper and most populous capital city. The city, located in northern China, is governed as a direct-controlled municipality under the national government with 16 urban, suburban, and rural districts. Beijing Municipality is surrounded by Hebei Province with the exception of neighbouring Tianjin Municipality to the southeast; together the three divisions form the Jingjinji metropolitan region and the national capital region of China.
Document 15: Benxi: Benxi () is a prefecture-level city located in the east of Liaoning province, People's Republic of China, south-southeast of the provincial capital Shenyang. Its population was 1,709,538 at the 2010 census whom 1,011,377 lived in the built-up area made of 3 urban districts (Pingshan, Xihu and Mingshan). It was founded as a metallurgical center in 1915. Benxi Iron and Steel Company (Bengang) is the largest employer in the city, and used to be the fourth-largest steel company in China. The second-largest industry in Benxi is coal mining. Benxi has pollution problems due to steel production and coal mining.
ground_truth: China