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It is known that Democratic People's Republic of Korea and Soviet Union (Russian Federation) have concluded six agreements from 1985 to 2004. In accordance with those agreements, the boundary of two countries is divided into two parts, one is river boundary on the Tumen river, the other is boundaries of territorial water, exclusive economic zone and continental shelf on the East Sea. The starting point of the two countries' boundary is the intersection of the three boundaries of DPRK, Russia and China on the Tumen river. According to ‘Agreement among the People's Republic of China, the Democratic People's Republic of Korea and the Russian Federation on the decision for boundary lines of territorial waters on the Tumen river’ concluded with China, DPRK and Russia in 1998, the boundary point of territorial waters of the three countries on the Tumen river is the intersection in which the extended line of boundary point of China and Russia and the middle line of main waterway of the Tumen river across each other on the Tumen river. There are, however, no exact coordinates of the boundary point of three countries that is a starting point of DPRK and Russian border lines neither in the agreement nor ‘Treaty between the Union of Soviet Socialist Republic and the Democratic People's Republic of Korea on the Demarcation of the Soviet-Korean National Border’ which is the first agreement relating to borders in 1985, so it couldn't be able to grasp definite substance for border lines on the Tumen river. After that, the exact coordinates of the boundary point of three countries on the Tumen river has been released in ‘Supplementary Description Protocol to the Eastern End of National Border Line between the People's Republic of China and the Russian Federation’ concluded in 2002. Direction of border line between DPRK and Russia which is progressing along the main waterway of Tumen river from the boundary point of three countries on the Tumen river has been noted in Description of the Treaty on the Demarcation of the Soviet-Korean National Border in 1985. This border line goes along the main waterway of Tumen river and arrives at middle point of the line connecting two spots-one is the most southern end of Russian coastline and other is the most northern end of DPRK's East Sea coastline. The middle point is the end of border line between DPRK and Russia on the Tumen river. The correct coordinates of this middle point had not been referred to in Description in 1985, but it has been released in ‘Agreement between the Government of the Union of Soviet Socialist Republic and the Government of the Democratic People's Republic of Korea Concerning the Regime of the Soviet-Korean State Frontier’. The end point of the border line on the Tumen river, at the same time, is the starting point of territorial water line on the East Sea between the two countries. That is, according to ‘Agreement between the Government of the Union of Soviet Socialist Republic and the Government of the Democratic People's Republic of Korea on the boundary of Economic Zone and Continental Shelf’ concluded in 1986, the starting point of territorial water is located in the mouth of Tumen river where the border line on Tumen river between the two countries is ended. From this point, territorial water line is demarcated on the East Sea based on 12 nautical mile of territorial water regime, and the straight line extended from the end point of territorial water line is constituting border line of economic zone and continental shelf between two countries on the East Sea. In brief, the border line of territorial water, economic zone and continental shelf between DPRK and Russia is a single line on the East Sea, and it could be the first case in East Asia. The right to go into East Sea for China relating to border lines of DPRK and Russia has not been solved for a long time. China keeps making efforts in private sector to resolve this problem called ‘going our of East Sea’ which is obstructed by DPRK and Russia. Recently, the State Council of China passed ‘the Plan of Collaborative Development for Tumen River Area’ aiming at economic development of northeast area, and it indicates that Chinese government has recognized it is essential to take back the right to go out of East Sea for developing northeast area in Chinese economy.