Historical maps of China compiled by Soviet Union had little to no problems prior to Yuan Dynasty and are relatively objective. The drawn maps of Han Dynasty are similar to those drawn in China, but maps of Tang Dynasty are not much different.
However, since Yuan Dynasty, there have been problems with Soviet version of Chinese historical maps. The territory of Yuan Dynasty drawn by Soviet Union reached coast of Heilongjiang in northeast, but did not reach lower reaches of Heilongjiang and northern coast, mostly remaining within current Sino-Russian border. In fact, Yuan Dynasty once built Marshal Zhengdong's mansion in Tlin at mouth of Heilongjiang River, which shows that Yuan Dynasty actually controlled Heilongjiang River basin. However, Soviet version slipped North Korea into territory of Yuan Dynasty, which is more objective, because Yuan Dynasty once created an eastern province in North Korea.
Map of Mongol Empire
The Soviet version of Ming Dynasty map broke Ming Fan's heart. On map, Ming dynasty was limited to hinterland and Liaodong. Regimes such as Mongolia, Eastern Chagatai Khanate, Tubo and North Korea also exist in vicinity. However, this map of Soviet version is very biased, because scale of Mongolia in picture is too small, and northernmost part of Mongolia at that time should have reached Lake Baikal. Later, Russia invaded east and occupied lands of Buryat-Mongols here.
The Soviet version of Qing Dynasty map also has ulterior motives. The 1 million square kilometers of land north and east of Heilongjiang was not mapped during this heyday. These lands were not occupied by Russia until 1858. They are trying to brazenly prove this map of Soviet version "from ancient times"?