东北亚地区经济合作趋势及其开放性尹秀艳一、东北亚地区经济合作趋势对东北亚区域的界定，国内外学者有各种说法：有人认为东北亚包括环日本海诸国，即日、韩、朝、俄远东、中国东北三省，也有人认为应该加上蒙古，还有人进一步把中国的山东、河北、内蒙古、天津、北京都... Trends and Opening-up in Northeast Asia Economic Cooperation Yin Xiuyan I. Trend of Northeast Asian Economic Cooperation For the definition of the Northeast Asian region, scholars at home and abroad have various opinions: Some people think that Northeast Asia includes the countries around Japan, South Korea and North Korea , The Russian Far East, and the three northeastern provinces of China. Some people think that Mongolia should be added as well as others to further China’s Shandong, Hebei, Inner Mongolia, Tianjin and Beijing.