Today's Sino-Russian border line is mostly inherited by Russia (with minor adjustments) from the Soviet Union, while the Sino-Soviet border line was essentially the same as the border between the Russian and Qing Empires, settled by a number of treaties from the 17th through to the 19th centuries. Border issues first became an issue following Russia's rapid expansion into Siberia in the 17th century, with intermittent skirmishes occurring between them and Qing China. Below is a list of important border treaties, along with the indication as to which section of today's Sino-Russian border were largely set by them: