Mudanjiang | Heilongjiang
Suifenhe (simplified Chinese: 绥芬河; traditional Chinese: 綏芬河; pinyin: ), is a county-level city in southeastern Heilongjiang province, People's Republic of China, located situated where the former Chinese Eastern Railway crosses the border with Russia's town of Pogranichny, Primorsky Krai. In January 2014 Suifenhe became the only Chinese city in which trading with Russian Ruble is allowed. The city shares its name with the Suifen River, and is under the administration of Mudanjiang City.
Suifenhe and the surrounding border areas were scenes of vicious combat when the Soviet Union invaded Japanese-occupied Manchuria in August 1945.[Wiki]