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沙皇俄国是欧洲国家，原本不与我国接壤。１６世纪末，沙俄越过乌拉尔山脉，逐步东侵，占据了辽阔的西伯利亚。逼近我国。１７世纪上半叶，我国东北战乱。沙俄伺机侵入，强占了雅克萨（今俄罗斯的斯科沃罗丁诺）和尼布楚（今俄罗斯的湟尔琴斯克）。他们在此修筑城堡，作为侵略?
Tsarist Russia is a European country that did not originally border China. At the end of the 16th century, when Russia crossed the Ural Mountains and gradually invaded, it occupied a vast area of Siberia. Close to our country. In the first half of the 17th century, the war in northeast China. Czarist Russia invaded and seized the positions of Jacques Saarow (now Russia’s Skovorodino) and Nibugu (now Russia’s Kirchchend). They are here to build the castle, as an invasion?