一、中俄(苏)边界形成的历史沿革1689年，中俄签订了《尼布楚界约》，这是中俄两国签订的第一个界约，也是中国外交史上与外国订立的最早界约。它从法律上肯定了黑龙江、乌苏里江流域的广大地区是中国的领土。170年后，沙皇俄国乘腐朽的清王朝处于内忧外患之机，迫使清政府与之 I. Historical Evolution of the Boundary between China and Russia (Su) In 1689, China and Russia signed the “Treaty of Nebuccus”, which is the first boundary between China and Russia and also the earliest conclusion of the history of China’s diplomacy with foreign countries Bound about. It legally affirms that Heilongjiang and vast areas of the Ussuri River basin are China’s territory. 170 years later, the tsarist Russia took a decadent Qing dynasty in internal and external turmoil, forcing the Qing government